Ok, I know this is an old site, I first came across it about 3 years ago, but some of the definitions are just insane.
My favorites..
http://www.urbandictionary.com/define.php?term=strawberry+cheesecake
http://www.urbandictionary.com/define.php?term=russian+goggles
My favorites..
http://www.urbandictionary.com/define.php?term=strawberry+cheesecake
http://www.urbandictionary.com/define.php?term=russian+goggles