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Residual urine that is present on an individual after using the bathroom. Because of its sometimes sticky nature, it is attributed to being the juice of a watermelon that was supposedly recently consumed by the individual.
Person 1 is shaking hands with Person 2 who has just walked out of the bathroom.

Person 1: "Why are your hands so wet and sticky?"

Person 2: "That's just some watermelon juice from my lunch."
by DC Derailleurs July 05, 2012
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