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If someone calls you mad as a hatter, they're saying you're a complete idiot who acts like a lunatic. You're not crazy enough to be locked up, but you're close.
My mom said I was mad as a hatter after I tried to fight a vacuum cleaner.
My teacher called me mad as a hatter for throwing a pencil at the principal.
My dog was mad as a hatter when he thought the mailman was a robber.