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A jabba-mouth talks like they're the smartest person in the room, but they're just full of hot air and wrong about everything.
'You think you're right? I'm the only one who knows anything!', said to a kid who got a better grade.
''You’re wrong, and you always are!', after being proven wrong for the 10th time.
''You're just jealous because I'm right!', said to someone who's clearly not jealous at all.