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A dumbass who thinks he's the biggest idiot around and laughs at his own stupidity while everyone else is trying to ignore him.
Mabrah: 'I'm the smartest guy in the room!' (He just spilled his coffee on his pants.)
Mabrah: 'I'm not dumb, I'm just... flexible.' (He tripped over his own feet.)
Mabrah: 'I'm the king of the dumb!' (He walked into a wall.)