A shitty website.
It's only successful because the founder of the site works for Google and added coding on Google to make Urban Dictionary appear on just about any Google search you make.
Ass-rapes you with pop-up ads if viewed in Internet Explorer. Should only be visited using Firefox with Ad-Block Plus.
Notice all the good, clever, and useful definitions on Urban Dictionary were written before 2005? Every new definition looks and reads like they were all written by 5th-graders.