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When someone does something so dumb that another person has to slap their own face with their palm just to keep from screaming or throwing up.
My cousin tried to explain the internet to his dog. I facepalmed so hard my hand went numb.
My boss said he's going to quit. Then he signed up for a Zoom class on how to be a better boss. I facepalmed so hard I got a headache.
My friend tried to eat a whole pizza in one bite. I facepalmed because I felt his pain.