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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


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


Twin Piston

When a male wears a strap-on backwards and proceeds to have sex with two women at the same time. One in front and one behind

Bro, my ex called me last night and wanted to have a three-way with her best friend. Needless to say, I brought out the twin piston

by sthrock4 May 4, 2017


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

15๐Ÿ‘ 10๐Ÿ‘Ž


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

5๐Ÿ‘ 2๐Ÿ‘Ž


shit piston

A faggot's cock. It is continually going in and out compressing shit until it finally fires

Grass doesnt grow on a busy street. That poof has a bald arse because he is constantly being thrashed by a shit piston

by LuciferDarklord January 28, 2008

5๐Ÿ‘ 2๐Ÿ‘Ž


Stiff Piston

An uncontrollable erection which lasts for a long period of time, despite attempts to flaccidate.

That girl kept staring at my Stiff Piston, it was so embarassing

by rangadale May 11, 2010

5๐Ÿ‘ 2๐Ÿ‘Ž