Custom UD mugs
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1. Piston
Double penetration sex, with one man fucking the girl in her vagina in and the other in the ass. They alternate thrusts to create a piston action, much like that of an engine.
"You take her in the ass, I'll take her in the pussy and we'll piston her"
2. piston
somebody who is sh** ugly
Eww you like him he a piston.
3. piston
someone who is an idiot
you're a complete piston
by mandy Apr 2, 2004 share this
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