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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The sexual or nonsexual act of hopping up and down tescticle first on another's testicles.
John-"Where's Jimmy and Mackie."
Jeremy-"Ball bouncing at the masterbasium... where else."
by Duke Silver September 1, 2017
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When you ask someone if they want to do something with or for you and they say no with a little tude (attitude).
Hey, We are going to a show, do you want to go? or Hey, can you help me move? They say no, you say "what ever makes your balls bounce"
by Ms D October 22, 2010
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