Top Definition
N breast that pendulate on a radial axis and when one is acted upon by force as to set in motion in such a way that it collides with the other subsequently transferring the force or kinetic energy to the adjacent breast. Basically swinging tits that emulate newton balls. Typically found on sporty older women (gilf type) that cruise braless in bars.
Damn Ron, look at the Newton Titties on that old lady, now that's kinetic energy at work!
by Jellubuiscuit July 17, 2013

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