Rub Dog

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."

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prairie dog rub

The mark left in your underwear where a prairie dog rubbed its nose. A skidmark

The wife always bitches on laundry day if she finds a prairie dog rub in my shorts