When one swings his testicles in a circular motion similar to a vertical helicopter blade. Usually performed in front of some audience.
Hey John it's a bit windy in here... No bro, that's just the vortex from my Testicopter.
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When tour travel at the Speed of light and your balls start Rolling like elicopter thingy do.
It cool.
Negative effects: balls on Fire.
"Hey Jon! I was going home when i started fucking ballin'(testicopter)! Me balls on Fire."
"Fuck"