What is Piston?
1.
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.
somebody who is sh** ugly
Eww you like him he a piston.
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3.
someone who is an idiot
you're a complete piston
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1.
A Competition where you and your friends see who can go the longest without masturbating or having sex...
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A slang term or code-talk for smoking crystal meth.
I was talking to sally earlier today.
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1.
something you give a girl when you like her, but she doesn't like you.
"I gave her penicillin, and she said we could be more ..