A Dictionary of Slang 
English slang and colloquialisms currently used in the UK.
http://www.peevish.co.uk/slang/
Businessballs.com - Cockney Rhyming Slang 
Origins, derivations and dictionary translations. Cockney rhyming slang uses substitute words, usually two, as a coded alternative for another word.
http://www.businessballs.com/cockney.htm
Carleton County Colloquialisms 
Dictionary of the colloquial language of Carleton County, New Brunswick, Canada and Aroostook County, Maine, USA. Audio clips accompany each entry.
http://dooryard.ca/
Double-Tongued Word Wrester 
A growing dictionary of words from the fringes of English, including jargon, slang, and loan words.
http://www.doubletongued.org/
Insultmonger.com 
An alphabetized compendium of expressions considered offensive, vituperative, and insulting.
http://www.insultmonger.com/slang/index.htm
London Slang 
Online word and phrase dictionary of Cockney rhyming slang. Also includes examples of film slang.
http://www.londonslang.com/
PseudoDictionary 
Covers slang, made up words, "webspeak", colloquialisms and accepts contributions for new entries.
http://www.pseudodictionary.com/
Sayings Explained 
Searchable database of well-known sayings, phrases, and slang, along with definitions and origins.
http://brochuresonline.net/sayings/
Slang Search 
Definitions of common words in English-language slang, organized by subject area.
http://www.slangsearch.com/
SlangSite.com 
A dictionary of slang, webspeak, made up words, and colloquialisms. Submissions welcome.
http://www.slangsite.com/
Urban Dictionary 
U.S. slang dictionary whose submissions and various definitions are subject to votes for inclusion.
http://www.urbandictionary.com/
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