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A lazy way to say you're too dumb to understand and don't want to admit it. It’s like giving the finger to the person who asked.
"I don't know what that means" after I asked why the teacher gave me a zero.
"I don't know what that means" when I asked what a 'vague threat' was.
"I don't know what that means" after I asked what 'trolling' meant and got a side-eye.