UrbanDictionary.com is an E2-like database driven site, designed to be a one stop resource for the incomprehensible rude boy slang that is floating around these days. Whether it's "fo shizzle, my nizzle" ("For sure, my nigger") or "chicken" (delicious but no good to pet animal) you want a definition for, UrbanDictionary has it.

The main differences between E2 and UrbanDictionary
UrbanDictionary is far less closely scrutinised than Everything2, and it shows. Bad grammar and spelling is rampant, and entries rarely get deleted.

Instead of voting up and down the writeups (called "definitions") you select the one that is your favourite and that counts as a vote in its favour. Generally, there are some great definitions on there and there is some crap that would send dannye or any other E2 editor into a fit or apopleptic rage (you thought Butterfinger McFlurry was bad?).

Nodes cannot be locked like on E2, and you get multiple pages with about 10 definitions on rather than one lumpen mass. There is no catbox and no way to contact other users unless they list their email address, ICQ number or AIM screen name. Personal diatribes are not allowed and there are no daylogs, as while E2 is just (just!?) a writers haven/encyclopedia, UrbanDictionary is just that: a dictionary. Noding about noding is forbidden for obvious reasons, but noding for numbers is doubleplusgood on UD.com.

As far as I can tell, there is no XP system on UrbanDictionary and as such there would be no need for it.