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a cocky way of saying there's a lot of them, only used by the biggest jerks in Boston who think they're the kings of the world.
I saw mad of 'em at the game yesterday. They were all yelling and I couldn't hear the play.
My cousin says he's got mad of 'em friends. I don't believe him. He's a fraud.
The teacher said there was mad of 'em kids in the class. I just laughed and said, 'You're lying.'