A ball buster is a guy who likes to bust your chops. Ball busters are very annoying. At first when they don't know you they are polite and pleasant. But after they get to know you for a day or two, they start taking the liberty to bust your balls making stupid sarcastic jokes about you all the time. At least 75% of American males are ball busters.
A sexual act in which one partner performs an elbow drop onto the other's exposed testicles, similar to the move popularized by the Columbus, Ohio born WWE fighter Randy "Macho Man" Savage.