An online resource that is generally very useful when seeking definition for slang words and phrases. However, there are a great many people who have added entries who cannot spell or use grammar & punctuation correctly, which their contributions to the lexicon useless.
For example: there, their and they're are often used incorrectly in the Urban Dictionary. The misplaced apostrophe - do'nt, ca'nt, was'nt etc. And mispelling slang words, for example the contraction of the word 'whore' is 'ho' not 'hoe' - this a tool for gardening.
Timmy did awfully on his term paper because he looked up definitions on Urban Dictionary. Timmy thought it was funny, but his professor did not. Don't be like Timmy.