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Random
When you put both balls into a girls (or guy's, we don't judge) asshole and s/he farts them back out. A satisfactory "pop" can be heard if done correctly
I was feeling a little adventurous so I had my girlfriend give me a Chillicothe Cannon Ball
When a female agrees to tuck a males scrotum into her anus, fart, and toss the scrotum like a pair of marbles through the air .
Man, Brenda sure does know how to give a great Chillicothe Marble Toss . I'm still feeling it today !