There are lots of interesting slang glossaries available online. These are selected to give an idea of the range of approaches and design:
Indiana Street Drug Slang Glossary
University of Georgia Dawg Speak
For a more comprehensive list of online slang dictionaries, see:
Peevish Slang Links or Surfing for Slang
These both list dialect and colloquial glossaries as well as those dedicated to slang.
(c) Julie Coleman, University of Leicester. Contact the author.