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
by Beaverdog February 07, 2020
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.
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, 2009
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 04, 2017
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.
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.
by EMOGRILL August 04, 2008
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
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.
by Rim Dad Toucher February 20, 2011
by rangadale May 11, 2010