I love trivia! I find I incorporate it in my novels too. Interesting trivia lends an air of authority to your subject matter. I’ve found a number of sites dealing with the lingo of specialized groups and I hope you enjoy the 3 I’m sharing today!
A Glossary of American Mountain Men http://user.xmission.com/~drudy/amm/gloss.html
Australian Slang Dictionary http://www.koalanet.com.au/australian-slang.html
United States Army Airforce Glossary http://www.warbirdsresourcegroup.org/URG/glossary.html