I've come across lots of hip-hop dictionaries on the Net, but this is the first I've seen that's specific to the Bay Area (sorry, the Yayo). The rapper most responsible for developing Bay Area rap lingo is E40 -- he was the first to start adding "eezy" to the end of words -- and you can tell that a lot of the terminology in this dictionary comes from him.
Not sure how up-to-date the terms are, but there's some great stuff in here. Of course, we all know what Hyfee means (if not, see this post). But apparently we're also supposed to call the Hall of Justice "850" (since it's on 850 Bryant). I wish I had known this when I had jury duty!
Some others I liked:
Bama: Someone who does not know how to dress. For example, someone who wears a red shirt with bust up no name jeans.
Da mob: East Oakland residents that put money over b*tches.
Dipped in Butta sauce: Hella fitted, g'd up, creased up from tha feet up.
Fedex: an individual that delivers quick mail (money).
San Francyco: San Francisco
RWC: short for REDWOOD CITY in the Bay Area.
"sch": Adding "sch" to the beginning of a word. Example: 7/11 would be "schemevin eleven." Smoke = "Schmoke." (From San Jo)