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1.
See "jackoffathon".

To masturbate vigorously, either alone or with friends/girlfriends, multiple times for an extended period of time.
Jack's wife had gone to her parents' house for the weekend. Since he had ordered the Playboy channel and didn't want all that hand moisturizer to go to waste, he decided to plop down in front of the TV and have himself a jerkoffathon.
by actionman777 April 01, 2010
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