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A facehorn is when you slam your face into the steering wheel so hard it sounds like a car horn. It’s for when someone does something so dumb it makes you want to yell at them and the road.
My cousin tried to parallel park in a phone booth. I facehorned him so hard the neighbors called the cops.
My mom saw a guy try to eat a whole pizza in one bite. She facehorned him like he’d insulted her family.
I facehorned my brother when he tried to text me while driving. He got a ticket and I got a headache.