One who blares rap music at full volume with all windows open in his car, much to the annoyance of anyone else in a 30-foot radius.
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.
My drive from Atlanta to Orlando was plagued by the presence of a blastard that stuck by me on the highway the whole time. Now there's 8 hours I can't get the fuck back.