It is this website where it was a good site until 2005 the definitions were about p0rn and s3x. WHY URBAN DICTIONARY WHY
Example 1-Y/N:*looks up muffin*
Urban Dictionary:A girls vagina Y/N:I first thought it was a food
Example 2-In 2003: A watermelon is a fruit blah blah blah...
Now: A watermelon is a term for cum