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.

piston pump by Boozy Barfly November 11, 2008

pistol grip pump 

A sawed-off shotgun, retrofitted with a handle at the stock. Note: the gun must be a 12 gage pump to be an official pistol grip pump. Originated in Detroit on the south side alleys.

Riding in J's 64 Impala, I held the pistol grip pump on my lap at all times, waiting for suckas to play with my shit.

pistol grip pump by Slippy Steve February 15, 2005

pistol grip pump 

the act of anally fisting a mans ass while jacking him off. as if you are shooting a pistol grip pum shotgun

that guy is a freak he likes to get pistol grip pumped

pistol grip pump by victhespic July 17, 2011

pump action pud pistol 

Another term for the male anatomy.

Tonight I think I’m gonna go home and squeeze off a few shots out of the ol’ pump action pud pistol.

pump action pud pistol by Dr. Shirley August 31, 2023