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When a male sits down in a seat and accidentally sits on his balls. This is usually accompanied by a shouted expletive and an abrupt jump out of the seat. It happens so quick, it's as if they've bounced off of their balls.
Teacher: "Greg your late, sit down!"

Greg: "Sorry teacher....OW FUCK!"

Teacher: "Greg! Watch your...oh wait was that a ball bounce?"

Greg: "Yes ma'am...sorry."
by Jason Aldean July 26, 2014
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