give (one) a melvin
To cause one's underwear to become wedged between the cheeks of one's gluteal muscles (butt cheeks), typically done as a prank. These pants I'm wearing are giving me a melvin while I walk. The group of bullies gave him such a bad melvin that he could barely walk. My idiot brother and his friends think it's hilarious to torment me—they'll give me a melvin, put me in a headlock, all that annoying stuff.
melvin
A maneuver in which someone's underwear is yanked up from behind until it is wedged between their buttocks, typically as a prank; a wedgie. I don't know if it's the pants I'm wearing or the underwear, but I keep getting a melvin while I walk. The group of bullies gave him such a bad melvin that he could barely walk.
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