Urban Dictionary

UrbanDictionary.com. Well, it's not Everything2, but it might have potential. Unfortunately, this site currently seems to be populated with definintions of so-called Urban Slang that is:

1. US-centric,
   
2. of poor quality (many entries contain blantant spelling errors and there appears to be a distinct lack of editing: many repetitious entries for the same word - despite the fact that the site states that "Definitions may be edited"), and
   
3. homophobic and sexist (probably racist too, but I didn't stick around to find examples of this).