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A bunch of guys named Jack all trying to see who can jerk off the loudest, the longest, or the most embarrassing. It's like a contest, but with more cum and fewer rules.
Jack from the gym challenged Jack from the bar to a Jack Jack Off Off. The loser had to eat a whole pizza.
At the family reunion, three Jacks from the same family started a Jack Jack Off Off. It was loud, it was messy, and it was glorious.
Jack from the office started a Jack Jack Off Off in the breakroom. Everyone joined in, even the intern.