For me it's gotta be:
Chamillionaire - Riding Dirty (When I'm in a hog)
Some diiiiiirty dubstep for game lobbies
and for random gameplay or deranking, pingu or punjab MC full blast :)
Oh and of course...
Rick Ross - Hustlin' for when that 1600 you send me "doesn't work"
lol
Edit: And yes this IS for when your being a douche :)
[Edited on 12.07.2010 9:21 PM PST]