3 links
Commonly-Used American Slang
manythings.org
An alphabetical list of words and expressions, set out as a quiz with hidden answers.
The Dictionary of Informal, Slang and Idiomatic Phrases
geocities.com
Definitions for all the common expressions used in everyday English speech, with examples of sentences using them.
Twists, Slugs and Roscoes: A Glossary of Hardboiled Slang
miskatonic.org
Definitions of the lingo used in the crime fiction and movies of the '30's and '40's.