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When a man, nude, between two females, as he is fingering both of them, one of them has a hand on his balls and the other is jerking his penis vigorously until they all get off.
Looks like a triple piston kind of night.
When two men or women get on all fours with their anuses pressed together and push a lubed tampon back and forth between their rectums.
Don't throw that used tampon away, me and Bob want to do the Playtex Piston.
Car Engine production company.
Mushroom Piston Engines supplies me.
a WEENURR
this is my pork piston. it goes in your cumbustion chamber.
A Minecraft sticky piston
I'm gonna fuck venessa with my minecraft sticky piston
n. adj. A greasy piston is a person that indulges in activity of the homosexual persuasion. Greasy coming from the chocolatey brown color of shit, and piston from the penis and it's motion in and out of another man's rectum.
I think you are a greasy piston.
piss-ton-ing
(verb)
Rapid back and forth motion contained within the ass (closed first or otherwise) without removing the hand.
(see also: Fisting)
Him: So, how do you like to get fisted?
Me: Pistoning is my favourite! Piston my hole so fast until I cum without jerking off.