Often two blastards will get into a volume war with their music, leading to a horrid-sounding mishmash of rap beats and cuss words that you can't keep from assaulting your ears even if you close your windows.
blue uniforms + acting like a bastard = blastard
Anybody who does something to piss you off, especially people of authority. (police, bouncers, PO)
I know that blastard didn't just cut me off!