A reciprocating (often involuntary) motion of a hand around a peanus resulting in a spluttering of a gooey substance from the orifice of the above mentioned peanus. Often, the peanus belongs to the hand but not always. If unobstructed, the travelled distance of the substance varies directly as the pleasure the owner of the peanus will experience.
Yesterday I jacked off (regular verb!) on a girl sleeping next to me in the train and I polluted her forearm with my sperm! I was very proud of myself!
by maldoror June 23, 2004

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