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In the scenario of a male orgy, 'Ballsack Bingo' is used to define the act of writing numbers on the ballsacks of other participants of the orgy, then picking one out at random, subsequently engaging in such acts as hearty reacharounds!
Yes Mum, I had a great time last night with the guys! We played Ballsack Bingo until dawn!
by HandFlapper403 April 09, 2011
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