Regional Slang...

[Classic Rocker]

Here are mine..

Mad: a substitute for "very" (That was mad good)
Grindage: food (I'm gonna go get some grindage)
Served: see GameMaster's explanation
Rad: cool (That was so rad)
Righteous: when something is very cool
Holy Detonators: from the old batman! I say it from time to time.
****tard: when someone is extremely stupid

Those are my used slang along with most of my friends in the area. Of course you have the ghetto slang, but I'm against most of that crap.