Much like a blood spot that a woman gets on her pants during her period, the balloon knot spot is when a man's ass begins to bleed after too much anal sex and a blood spot is visible through his pants around his anus.
Steve: Hey Lance, you better change your pants again.

Lance: Why, did I poop myself again?

Steve: Nope, you've got yourself a balloon knot spot!
by ballsackreligious March 13, 2013

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