Finnish slang. Comes from the word pissa-liisa = piss-Lisa. A teenage girl that in most common beliefs wears a lot of make-up, hangs a lot outside with a group of friends drinking sweet cider, smokes, wears tight clothes and likes expensive brands like Dolce&Gabbana or miss sixty.
Often used when calling other people as lissus, people don't like being called one themselves.
Se on ihan kauhee lissu! - She's a real lissu!