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A sex act consisting of the achievement of orgasm due wholly or partially to the stimulation of the grundle.

A.K.A: GJ, Taint Crank, Chocolate Smoothy, The Half and Half, Unholy Paradise, The Rub and Scrub.
After 15 hours of persistant effort, Eric's Grundle Job finally resulted in a blood, sweat, and semen fiesta.
by BBizzleBarr January 31, 2006