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A more healthful alternative to standard male masturbation, which is is performed in the decidely lazy position of sitting down.

A jerkin' jack is simply a standard jumping jack with the exception of one hand being devoted to masturbating.

5 minutes of jerkin' jacks burns approximately 1300 calories
Kent: What do you do to put off the weight, joe?
Chris: And jerkin' off doesnt count
joe: it does too, i do Jerkin' Jacks.
by Man Balls April 24, 2007
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