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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.
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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.
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the femal version of a dutch ruuder
"gosh, joe gave me a great german piston last night"
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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.
A penis, typically one quite virile and DTF.
You know, Gwen Stefani may be pushing 50, but I'd still give her the ham piston.
Yet another slang term for penis. It is meant to be humorous and not as offensive as some other slang terms.
Fred : "Dude, I thought Darcy was leaving you."
John : "What can I say? She can't get enough of my butter 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.