This just popped up on Twitter from @freddint via @raykwong. It’s a dictionary of Cantonese slang used by gang members, dated 1994 and intended for law enforcement. From the file:

The purpose of this project is to provide a “starter” dictionary that can grow with additions from law enforcement officers investigating Asian criminal activities as well as academic and community sources interested in Asian gang culture.

It’s pretty interesting, though I’m certain it would be more so if I had more experience with Cantonese. Some of the entries are as follows:

開片　Hoi peen
　　　To start a fight
老毛　Lo mo
　　　Money Money containted in a red envelope given to the
　　　winnder of a fight by the loser
鐵　　Tit
　　　The police, a handgun
牛房　Ngao fong
　　　An illegal gambling den

A number of the entries aren’t really slang at all, for example 打牌 for gambling, but the few that are are fairly interesting.

It’s 68 pages, not including the index, each page having about 9 entries.　Here’s the link if you missed it above.