What is Piston Pump?
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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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rolling on floor, laughing my ass off, peeing my pants.
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The famous phrase that Vince, or the Sham-wow guy says during his infomercial for the Slap chop.
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