Piston Undo

A brutal fucking either Anal or regular.

Guy A: dude remember that girl from the bar

Guy B: yea

Guy A: I took her home last night and gave her a piston undo, she couldn't even get out of my bed this morning and kept complaining about how sore she was.

by Sourcherios December 28, 2010

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piston hondo

a character in punch out, he is the first opponent you face in the major circuit.
he also has a TikTok @pistonhondo

Oh man, I can’t defeat piston hondo.
have u seen piston hondos new TikTok?

by lol rat July 4, 2021

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dirty piston

When 2 guys shake hands and a third guy puts his penis in between the hands of the first two shaking thus making the hand shaker jack him off

I just got a dirty piston from those guys.

by Beaverdog February 7, 2020

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Fudge Piston

A sex move from the scat fetish category.

First, you bend the girl over and fuck her in the ass. Then you turn around, spread her cheeks and yours and take a good sized shit right into her buttcrack. Then you need to turn around and literally pound your own shit into her ass.

Kelly called the cops on Bill because he did the Fudge Piston on her.

by EMOGRILL August 4, 2008

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Zimbabwe Piston

you lay across two chairs then someone below you sticks a penis up your ass then you stick your penis on a person on top of you's ass. You must maintain constant insurtion, thus making it look like a piston of a car.

Last night George, Steve and I got two chairs and decided to Zimbabwe Piston

by Rim Dad Toucher February 20, 2011

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