Newton's Cradle refers to a girls crotch when she has skinny thighs so they do not touch each other when she is standing up.

This phenomenon enables you to tag her from behind, allowing your balls to swing freely between her legs without touching them, tapping the front of her, like the famed executive ball clicker --- the Newton's Cradle.
This phenomenon enable you to tag her from behind, allowing your balls to swing freely between her legs without touching them, tapping the front of her, like the famed executive ball clicker --- the Newton's Cradle.

She was in really good shape, a total Newton's Cradle.
by DTLWordsmith July 02, 2009
When the boobs of a girl resemble the infamous newtons cradle. By smacking the girls boobs together and having them Swing in the motion of the balls of newtons cradle hitting against one another giving it the same force back.
-What did you do to that girl?

--I did the Newtons cradle on those bitches tits.
by china. April 20, 2008
Describing the swinging action of at least 2 men's testicles as the slap against each other during anal sex.
They were at it so hard that their balls' were bouncing like a Newton's Cradle.
by Meatspin March 20, 2007
A two-man variation on 'teabagging' in which the four testicles represent the swinging balls of a Newton's Cradle. The slapping of the two scrotal sacs together in an approximation of the cradle motion is optional, if physically achievable.
Joe was so wasted, we took about 30 pictures of him getting a Newton's Cradle while he was passed out.
by Bee-ritt July 16, 2009
During the act of two men penetrating a single orifice of another person, their testicles collide causing a swinging effect similar to that of newton's cradle, the device used to display preservation of energy.
James: "Adam, you fancy doing a Newton's Cradle on Wendy?"
Adam: "Nah, me and Pete did that and my balls ache."
Pete: "Awww yuh."
by Wangrom July 12, 2010
The horrific and often timberfelling image of two men attempting a DP in a grumbleflick when their knackers collide.
Is that? Oh my God, I can't bear to look!
by Ted Hamer June 22, 2004
While in the Doggy Style Position, slap her tits as to mimic the Balls of a Physics toy known as a Newtons Cradle
She had huge tits..so I had to Newton's Cradle her
by S-T-G December 05, 2011

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