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When a guy whacks his peen against another guy's head so hard it leaves a fleshy cap on their face like a giant fungi.
My cousin did this to my uncle at the bar and now he has a mushroom on his forehead for a week.
At the football game, a guy hit another guy so hard he looked like he had a toad on his face.
My brother did this to his friend and now he can't wear a hat without people laughing.