Link: Russian Slang site

[wolk-off.livejournal.com]

For [numerous] those of you us fascinated with the magnificent Russian slang, there's a Web site completely devoted to that trash valuable part of the language. NOTE: it's in Russian, so you have to work hard in order to just get it. How relevant is the site? Well, its maintainer, Xenia Turova, is an educated linguist (she completes her Ph.D. thesis at Moscow State University) and a radio presenter on the Russia's best news radio, Echo Moscow.

There you go: Ксеня по фене.

However, the site's forum section is still far more comprehensive than the "Dictionary" section - it's probably because Xenia's part of Echo Moscow's REALLY valuable Russian language show, the weekly hour-long "Говорим по-русски", is just two minutes long.
BTW "Говорим по-русски" has its own forum which is really useful for advanced explorers of Russian.