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When someone won't stop spitting nonsense like they're the king of the trash talk.
My cousin's been going on for hours about how he's the best at everything. Hair of the monkey, I swear.
My teacher said I was talking too much. I said, 'I'm not talking, I'm giving a speech.' Hair of the monkey.
My dog barks at the mailman every day. I told him, 'You're the Hair of the Monkey.'