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A balls cannon is delivered by dropping one's trousers to moon someone, bending over far enough that the testicles become visible, waving the testicles at the recipient(s) with the hand, and shouting 'Baaalllllssss!'

The balls cannon can necessarily only be performed by a man.
I had no idea Andrew had such saggy balls until he gave me the balls cannon for the first time.
by M. C. Nasty February 17, 2008
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