When you are at a sauna after working out and you are naked and start rocking hips side to side as to hit their balls together.
Guy 1: Dude I was at the gym and some guy was playing Newton Balls next to me.
Guy 2: Ewwww.
by noobslaya703 May 16, 2011

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Top Definition
When a man's two testicle collide within the scrotum resulting in a painful feeling. Much like that desk toy with the swinging balls.
Why'd you stop running?
I have Newton Balls
by Gordonopus September 05, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt