Newton’s Cradle

The equivalent of a motorboat for guys. When a woman motorboats a mans balls vigorously. Often s

Dude, Jess gave me a mean Newton’s cradle the other night, my nuts haven’t been the same since.

by Big jig March 6, 2020

Newton’s Cradle

When a male is standing feet apart, and another male is standing behind tries to slap your butt, but instead his fingers come upon impact to a single testicle, which in turn Newton's cradle demonstrates the third law of motion. When one of the balls is lifted and released, it strikes the remaining stationary balls and sends force through all of them to push the ball on the other end away.

David stood behind Chris in Nanoom, attempting to slap his butt, however David accidentally missed Chris’s cheeks and his finger managed to hit a single testicle, resulting in a “Newton’s Cradle “.

by Nanoom secret December 28, 2023

Newtons Cradle

The action of testicles making contact during during a BGB threesome, where B1 enters G vaginally, and B2 enters G rectally.

So me and my boy had a threesome with this chick, everything was good until we had a newtons cradle happen.

by Dodo, The Dodo November 23, 2025

Newton’s Cradle

The act of one person slapping someone’s ass and then as the shoot forward, another tap goes to their crotch

Tom: Let’s Newton’s Cradle Jack
Harry: Ok you go round the front I’ll go round the back

by imad666 June 2, 2021

Newton’s Cradle

A modified spit roast. One guy’s dick in the girl’s mouth, the other guy’s dick in her pussy/ass. When one guy thrusts in, the other pulls out, and vice versa, so it looks like a Newton’s Cradle.

“Man, Sally’s such a slut.”
“Yeah, she let Tom and I give her a Newton’s Cradle last night.”

by AncientPig June 9, 2021

Newton's Cradle

When your penis is too short to successfully dock, so you end up clinking your testicles together, like the classic toy, Newton's Cradle.

Bro I thought we were going to dock eachother but we just ended up doing the Newton's Cradle

by gog1414 January 2, 2024

Newton's Cradle

The action of 2 men standing next to one another and swinging their balls in such a way that they swing back and forth due to the horizontal force of each set of balls making direct contact

"I want to Newton's Cradle with you"

by bobrob1234 November 3, 2021