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A penis. Usually used to describe a penis that is used in questionable activities, such as 'rubbing it in' with an underage girl, or or all male group masturbation.
"I've got a ruler! Get your rub dogs, men!"

"I had this 16 year old girl petting my rub dog on saturday."
by Ξ©ren October 08, 2008
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I was about to roll some ass but I didn't have any rubdogs. I asked my buddy for one but he doesn't believe in using rubdogs.
by Q ballsy December 01, 2007
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