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

Double Piston Chesty

Application of aerosol deodorant with a blast under each armpit followed by a slash across the chest.

Come on, dude, we're going to be late to meet the chicas. Finish getting dressed and let's go!

Okay, just a quick double piston chesty and I'm ready.

by rickbrunernyc August 03, 2009