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A facenuke is when you slap your face so hard it might fall off. You do it when you see something so stupid it makes your brain quit.
My cousin thinks the sky is green. I facenuked him so hard he went to the hospital.
My teacher said 2 + 2 is 5. I facenuked so loud the principal came running.
My dog ate my homework. I facenuked so hard my neighbors called the cops.