Top Definition
Laying on your non-dominant side's hip, proceed to lube your entire hand. Next, shove entire right hand inside your anus. It is best to feel around a bit before proceeding to your left hand. Your left hand will firmly grasp your phallic member and fondle your throbbing shaft. With both of your hands in motion the force applied thus shall be performing Newton's Third Law.
Mr. Schachter: How was your night? You were screaming quite loud.

Reginald: 'Twas grand. I performed the Newton's Third Law and used an entire bottle of kY.
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by One-Pump-Shotgun March 07, 2017

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When you're running and you can feel your penis flapping around.
No dude, I don't wanna run today - newton's third law always gets me...
by flagellum_mayor January 27, 2013

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