Alternative Dictionaries Collection of various forms of "bad language" from many languages. At the moment, there are 2743 entries in 162 dictionaries. http://www.notam02.no/~hcholm/altlang/ - More
Dictionary of English Slang and Colloquialisms of the UK A monster-sized dictionary of English slang and British colloquialisms (informal speech) currently used in the UK, listing over 4000 slang expressions. http://www.peevish.co.uk/slang/ - More
Urban Dictionary Slang dictionary that defines words used by people in American urban settings. http://www.urbandictionary.com/ - More