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A galumpkin is when a guy slathers peanut butter on his balls and squirts jelly on his butt crack. He bounces like a crazy man, smushing the mess together, and then some other guy eats it like it’s the best sandwich ever.
My cousin did a galumpkin in the backyard and my dog ate the leftovers.
At the party, the guy next to me did a galumpkin and it smelled like a broken toaster.
My dad tried a galumpkin and it was so messy, he looked like a science experiment.