Someone who never stops talking about the stupidest shit. Somebody that you wish you could just knock some sense into and tell them to stop being a dumbass.
A person who spends all of his free timetrolling, scamming, and producing smear campaigns on social networks against groups and individuals or Cyber Cancer.
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.