American Slang  
   Over 280 common American slang expressions sorted alphabetically.
   http://www.aitech.ac.jp/~itesls/slang/

American Slanguages  
   Talk like the locals in cities in America and around the world. The hick to hip translation guide.
   http://www.slanguage.com/

Australian Slang Quiz 1  
   An Australian slang quiz with lots of quizzes about idioms and whatnot.
   http://www.pacificnet.net/~sperling/quiz/aus1.html

Berkeley Slang  
   A collection of hellof rad stuff on the town of Berkeley, and the people who went to Berkeley High.
   http://www.hellof.com/slang.htm

Civil War Slang  
   A page of a larger History site. Ignore the Angelfire popups.
   http://www.angelfire.com/ms/genealogyinfo/page4.html

The College Slang Page: Da Bomb  
   About the College Slang Research project at California State Polytechnic University. Contains glossaries and articles about the use of slang in a college environment.
   http://www.intranet.csupomona.edu/~jasanders/slang/

Filters Magazine slang repository  
   slangin' up a fresh plate o' new words fo' that ace! Skateboarding and pop culture.
   http://www.filtersmag.com/Slang/

BuzzWhack  
   Buzzword-compliant dictionary provides definitions for business buzzwords, slang and jargon.
   http://www.buzzwhack.com/

A Dictionary of Slang Phrases  
   Every day phrases, idioms, slang words...A 8000-phrases up-to-date idioms and slang-dictionary.
   http://www.geocities.com/informalenglish/dictindex.html

A Guide to Irish Slang  
   From Arse to Maggot here is a full list of common Irish Slang
   http://www.irishabroad.com/Culture/Slang/

Urban Dictionary  
   The vocabulary of everyday life.
   http://www.urbandictionary.com/

'Strine Decoded: Dictionary of Australian English  
   Dictionary covers Australian English, including slang, rhyming slang, Aboriginal English, place names, and animals.
   http://www.artistwd.com/joyzine/australia/strine/

The Alternative English Dictionary  
   Part of a collection of on-line dictionaries of so-called "bad language".
   http://www.notam02.no/~hcholm/altlang/ht/English.html

Australian Slang Dictionary  
   Collection of Australian slang words.
   http://www.koalanet.com.au/australian-slang.html

Everyday English and Slang in Ireland  
   A comprehensive dictionary of Irish Slang with an "optimised for Print" page. Updated frequently.
   http://www.at.artslink.co.za/~gerry/irish.htm

Twists, Slugs and Roscoes: A Glossary of Hardboiled Slang  
   combination of slang spoken by Philip Marlowe, Sam Spade, Mike Hammer and the Continental Op. When Cagney, Bogart, Robinson and Raft got in a turf war, this is how they talked.
   http://www.miskatonic.org/slang.html

New Words In English  
   Neologisms and new uses of words in English.
   http://www.owlnet.rice.edu/~ling215/NewWords/

Roger's Profanisaurus  
   Glossary of sexual slang in English, mostly from Britain.
   http://www.ethick.com/other/Profane.html

PseudoDictionary  
   Covers slang, made up words, "webspeak", colloquialisms.
   http://www.pseudodictionary.com

Neologism Cliche Aphorism and Novel Language Pattern  
   Extensive list of new sayings, cliches, aphorisms, and neologisms. Has additional pages on related language matters.
   http://www.angelfire.com/nd/danscorpio/word4.html

Internet's Recommended Slang Links  
   Large collection of links to slang-related dictionary sites for regional varieties of English. There are also links to specialized slang in English and to sites on slang in German and in Scandinavian languages.
   http://www.spraakservice.net/slangportal/

Larry's Aussie Slang  
   Indexed slang and phrase dictionary.
   http://www.angelescity.com/aussie_slang.html

The Online Dictionary of Playground Slang  
   An indexed dictionary providing many of the colloquialisms and slang words used, past and present, over the English-speaking world.
   http://www.odps.org/