Urban Dictionary

Every now and then you come across some phrases, acronyms or just words that you simply don´t understand. Most of them are "slangs" (a type of language that consists of words and phrases that are regarded as very informal, are more common in speech than writing, and are typically restricted to a particular context or group of people.) 

One of the best places to look for them is:

www.urbandictionary.com

Although this site is extremely NSFW, is very entertaining and you ought to find any slang you have in mind.