Jock Butt

A firm, brick-like buttocks assembly usually rounding out a shaved crotch and hole.

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Butt jock cock-in-a-lock

When someone's jockstrap is wiggling from their anus, and gets the strap stuck on a jammed cock lock.

"I was rushing to class when I got Butt jock cock-in-a-locked and was stuck in place until the paramedics came along."

"Did you see Angelo get butt jock cock-in-a-locked during recess?"