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To jack off or masterbate. It origin comes from the vibrant red color the penile shaft takes on after a particularly vigorous rub-out session.
After the high school dance left Danny hot and bothered, he had no choice but to rub the rhubarb.
by Chicago Jeff October 04, 2006

Words related to Rub the Rhubarb

jack off masterbate penis rubbing the rhubarb teen angst