Chinese Slang (possible mature content) - Chinese slang dictionaries

there are a few of them, but the observation is that some of them assume that you are already familiar with the mandarin terms, and just need to know what the definition is.  But in any event.....

http://www.urbandictionary.com/define.php?term=chinese+slang

http://www.chinese-tools.com/chinese/slang.html

http://en.wikipedia.org/wiki/Mandarin_Chinese_profanity