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When you're wearing a thong, and your balls are so saggy that each ball falls onto both sides of the thong creating newton ball like balls, and you have someone put their tongue in between both balls, and swing the balls together like newton balls. :)
i'm going to Mewtons Knuckle you so hard your taste buds will never work the same.
by Throbin Hood June 13, 2016
Happy St. Patties Day!