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Backy penis is just a normal Roll-Your-Own Cigarette with a slight change.

Before you put your loose tobacco(Backy) into to your rolling paper, you rub the particles of tobacco over your penis or anothers penis. For extra pleasure some people ejaculate over the tobacco.
Peter: "Simon! You want to do some backy penis tonight?"

Simon: "Yeah sure. I'm up for that man"

Peter: " What shall we do? sperm or no sperm?"

Simon "Sperm!"
by Electromad May 10, 2010
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