Double piston

When a man or woman puts both of there fists inside a butthole or vagina and moves in conjunction While one fist moves down the other goes up. Like a engine piston.

I was screwing my wife last night and decided to give her the double piston elbows deep.

by Irishrover18 January 12, 2017

piston pump

Slang referring to an aggressive, furious, rapid act of fellatio. The piston pump receives its name from the rapid head movement exhibited by the provider of the fellatio, which is said to resemble the action of a moving piston. This is also referred to as the jackhammer. The piston pump is much sought after in the world of fellatio and should be received with grace and humility.

Man, that piston pump was great. I have never been sucked off so furiously.

by Boozy Barfly November 11, 2008

german piston

the femal version of a dutch ruuder

"gosh, joe gave me a great german piston last night"

by lars fredricksen January 9, 2009

Shit-piston

When your going anal with a bitch and she shits while your dicks in her ass forcing it back out like a piston.

I was with my hoe last night and while we were doing it she pulled a shit-piston.

by Donkeykong2128 May 31, 2015

Piston Neck

A man who has a piston as a neck

His head can not stop going up and down because of this

“This town ain’t big enough for the both of us, you god darn piston neck”

“You fucking piston neck”

“What are ya? A fucking piston neck?!”

“Get off my land you piston neck”

Or if you are a women

“Get your willy out of my face you piston neck”

“Get off my behind, you piston neck lookin retard”

Honourable mentions

Piston Neck Pete
Piston Neck Willy

by TheHungryShoe September 28, 2020

The rusty piston

The result of having rough anal sex, and your shaft is covered in feces and blood, giving it that rusty color.

I ran into my ex last night, and the rusty piston was on my bucket list.

by Jmc1971 CM75 September 3, 2018

Piston Puppet

How to describe a person that has been fucked so hard or for so long that their body flops around like puppet with every pounding thrust.

About 3-hours into the surprise gangbang party my wife was a pouncing bouncing spit roasted piston puppet. I warned her about trying to party too hard in the beginning but she's loves looking like a cock pierced voodoo doll within the 1st hour.

by Crumpedout_27 April 27, 2019