There is no Sörkka in Helsinki. There is a district called Sörnäinen, a metro station with that name written across the front of it, and a tram stop, and a police station that gave the neighbourhood half its reputation. Plenty of people say Sörnäinen. Plenty of the same people say Sörkka in the next sentence.
The same holds for most of the inner city. You can have an address in one set of names and a conversation in another, and the second set is not written down anywhere you will walk past.

The names the map does not have
| said | on the sign | where the slang name came from |
|---|---|---|
| saidSörkka | on the signSörnäinen | where the slang name came fromSwedish Sörnäs |
| saidRööperi | on the signPunavuori | where the slang name came fromSwedish Rödbergen |
| saidHagis | on the signHakaniemi | where the slang name came fromSwedish Hagnäs |
| saidSkatta | on the signKatajanokka | where the slang name came fromSwedish Skatudden |
| saidOgeli | on the signOulunkylä | where the slang name came fromSwedish Åggelby |
| saidKaltsi | on the signKallio | where the slang name came fromthe Finnish name, post-war |
| saidLaru | on the signLauttasaari | where the slang name came fromthe Finnish name, post-war |
| saidMustis | on the signMustikkamaa | where the slang name came fromthe Finnish name, suffixed |
| saidKontsa | on the signKontula | where the slang name came fromthe Finnish name, suffixed |
Terhi Ainiala, who studies Finnish place names at the Institute for the Languages of Finland, dates the oldest of these to the working-class districts of Helsinki at the end of the 1800s, and notes that a large share of the old slang names were built on the Swedish forms of the place.1 That is the reason for the shape of the left-hand column. Sörkka is a Finnish mouth repeating Sörnäs at speed, and Rööperi is the same thing happening to Rödbergen.
Then the city’s language changed and the names changed with it.
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11880s to the war: built on SwedishHelsinki's working districts were bilingual by necessity, and the slang was the shared ground. The names in this layer are Swedish street names worn down by Finnish speakers. All five in the top half of the table are still in daily use, which makes them the longest-lived slang in the country.
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2After the war: the same places, renamed from FinnishAs the slang itself became more Finnish, Swedish-based names acquired Finnish-based partners. Bergga, from Berghäll, gained Kaltsi from Kallio; Drumssa, from Drumsö, gained Laru from Lauttasaari. The old ones did not die. They ran alongside, which is why Herttoniemi alone has been Herde, Hertsika, Herttika, Herttis and Hertsu.
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3From the 1950s: slang becomes youth language, and leaves HelsinkiAiniala records the shift precisely here. Slang stopped being a city's shared code and became a generation's, and slang place names started appearing all over Finland. The humour arrived with it: Kannelmäki as Käkimäki, Myllypuro as Pyllymuro, Nordenskiöldinkatu as Nordenskikkeli, and Hattulantie translated into Stetson Street.

The suffix machine, which is the useful part
Most slang names are not inventions. They are the official Finnish name with the end cut off and a slang ending stuck on, and once you can see the operation you can run it backwards on a name you have never heard.
| ending | example | official name |
|---|---|---|
| ending-is | exampleHiekkis, Herttis, Mustis | official nameHiekkaharju, Herttoniemi, Mustikkamaa |
| ending-ari | exampleSimppari | official nameSimonkallio |
| ending-kka | exampleSörkka | official nameSörnäinen, via Swedish |
| ending-u | exampleLaru, Hertsu | official nameLauttasaari, Herttoniemi |
The same endings do the same work on the ordinary nouns of Stadin slangi, which is why they feel familiar before anyone explains them: duunari is a worker, hevari is a metalhead, fillari is a bicycle. Ainiala notes that even in the newer slang the great majority of names are formed this way from the official ones, so the jokes are the exception and the machine is the rule.1
Two syllables in, an ending on, done. If somebody says Mä asun Larussa and you have never heard of Laru, the operation you are looking for is the one that makes a place with four syllables into a word with two.

What the current layer sounds like
The centre of Helsinki slang is no longer Kallio. Heikki Paunonen, emeritus professor and the person who has collected school slang in Helsinki for more than forty years, names East Helsinki as the engine, for two reasons that sit on top of each other: it is the most multicultural part of the city, and from the 1960s onwards a great many people moved there from the old slang districts of Kallio, Vallila, Hermanni and Alppila, taking the vocabulary with them.2
His most recent large collection was made in early 2020 at three Helsinki schools. Just under a hundred young people returned close to a thousand words.
| word | what it is |
|---|---|
| wallah | Somali and Arabic, “I swear”. Out of East Helsinki in the early 2000s and now heard across Finland |
| nani | Japanese, from gaming. Roughly “seriously?”, and the first Japanese word into the slang |
| bro, bre | shortened from broidi, brother |
| sys | shortened from systeri, sister |
| tnää, hme, lpl | today, tomorrow, läpällä (as a joke). Written abbreviations that came back into speech |
| käty | kämppä tyhjänä. The flat is empty, the parents are away |
| käjä | kännijännä. The particular anticipation of a weekend that has drink in it |
Paunonen points at the direction of travel as the new thing. Social media is written language, he says, and words are now moving from there into speech, where until recently the traffic went the other way.2
That collection was made in early 2020. Youth slang has a short half-life, and several of these will already sound like something an older sibling says. The stable part is underneath: Paunonen counts about ten subject areas that slang words cluster into, and says they have not changed in over a hundred years.
The safe words are the old ones. Jätkä, kundi, äijä for a bloke, muija and gimma for a woman, jurrissa and fyllassa for drunk. Gimma's older sister bööna goes back to Stockholm slang of the 1800s and is still in circulation.
One word made the whole journey, and it shows what the layer does. Pöhinä meant amphetamine in East Helsinki drug circles in the 1990s. The rapper collective Notkea Rotta carried it into public use, and within a few years a Finnish prime minister was describing his own government as having hyvä pöhinä, a good buzz.2

The part that is not vocabulary at all
Ask Finns to describe how Helsinki sounds and they will not give you a word list. They will hiss at you.
The stadiässä, the Helsinki s, has been an object of national irritation for more than a century, and it has had a run of unkind names: the pop-star s, the pissis s, the gay s. Four researchers spent a peer-reviewed book on it.3
Mia Halonen, one of the book's authors, points out that Finnish has no standard s in the sense that saying it differently would change what a word means. Everybody recognises the Helsinki s; nobody can say what it is. Asked to imitate it, people exaggerate wildly.
The origin is a nineteenth-century argument. Helsinki was long Swedish-speaking and began turning Finnish from the late 1800s, and the new Finnish Theatre's actresses were native Swedish speakers. Reviews complained their s hissed too much and sounded un-Finnish, at exactly the moment when a pure Finnish language was a national project.
It nearly disappeared, and then it became fashionable. Johanna Vaattovaara traces the revival to 1950s popular song, and specifically to Laila Kinnunen, who had spent part of the war as an evacuated child in Sweden. Other singers copied the sound from her records: Virve Rosti has said in as many words that she copied the pop-star s. It became a marker of stardom, and later of Helsinki itself.4
The researchers’ least comfortable finding is about the listener. Many an s is simply heard as a Helsinki s once the speaker has been placed as a Helsinki person. Halonen puts the real load on the city rather than the sound: the burden is being from Helsinki, and the s is the thing an irritation can be hung on.4
The decoding order, if you are new here and trying to follow a conversation: names first, because they are stable and they are most of what you will miss. Take the first two syllables, look for the slang ending, and the official name is usually sitting underneath it.
Footnotes
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Slanginimiä sadan vuoden ajalta - Terhi Ainiala, Institute for the Languages of Finland, 16 March 2015, drawing on her chapter in Helsinki kieliyhteisönä (2006) ↩
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Stadin slangiin tulee lainasanoja jo japanista asti - Yle, 26 November 2020, interviewing Heikki Paunonen on a collection made at Helsingin Suomalainen Yhteiskoulu, Töölön yhteiskoulu and Stadin aikuis- ja ammattiopisto ↩
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Stadiässä - kokoaan suurempi äänne - Kielikello, reviewing Stadin syntinen s by Mia Halonen, Heikki Paunonen, Johanna Vaattovaara and Samu Nyström. The review notes the book is peer-reviewed ↩
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“Stadin syntinen s” ärsyttää jo ennen kuin puhuja avaa suunsa - Yle, interviewing Mia Halonen and Johanna Vaattovaara ↩











