the [in]famous HackerSlang dictionary
http://info.astrian.net/jargon/
http://www.science.uva.nl/~mes/jargon/
http://s23.org/seti23/jargon.htm
http://www.catb.org/esr/jargon/html/index.html
Jargon File on Debian:
apt-get install jargon-text vh & vh jargon
vh: Description: Volks-hypertext browser
Designed for use with the Jargon File but useful for lexicons in general (lighter-weight than WWW, fast search).
jargon-text: Description: The definitive compendium of hacker slang
This is the Jargon File, a comprehensive compendium of hacker slang illuminating many aspects of hackish tradition, folklore, and humor. This version is in the original text format and is best viewed with Volks-hypertext browser (vh), but can be viewed without it.
there is also the debian package "jargon"