| 1. | Piston | |
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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"
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| 2. | piston | |
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somebody who is sh** ugly Eww you like him he a piston.
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| 3. | piston | |
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someone who is an idiot you're a complete piston
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