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This is what you say when you're too dumb to understand what someone just said and you're too lazy to ask. It’s like saying you’re a brain-dead donkey who just got kicked by a robot.
I just said the pizza was on fire and you said, 'I don't even know what that means.'
She explained the math problem three times and he still said, 'I don't even know what that means.'
He tried to flirt with her and she said, 'I don't even know what that means.'