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When someone does something so dumb it makes your face explode and you have to slap your own face with your palm like it's your enemy.
Bro tried to eat a whole pizza in one bite and it came out his nose. Facenapalm moment.
My mom yelled at the TV for no reason. Facenapalm central.
My dog tried to drink from the toilet and got a face full of poop. Facenapalm city.