slang A large, oafish, typically unintelligent or foolish person, especially a man. Sometimes used endearingly or in self-deprecation. Some meathead at the bar has been hitting on Jenny for the last 20 minutes—I'm going to go help her get out of there. A meathead like me would never have a chance of getting into Yale, though! A football camp? No thank you—spending a week with two dozen meatheads does not sound like a fun time.

slang Foolish, stupid, or inept. I can't believe I made such a meatheaded mistake—I need to be more careful when I work! I don't want you or your meatheaded friends anywhere near my party, got it?