sweat beading or dripping into the crack of your ass during a strenuous physical activity, usually resulting in a tell-tale wet streak on the ass of your pants. Often used in a derogatory fashion implying bad body odor
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Get the swass mug.Swass is when you are riding on the subway in Boston and the aquarium doors open. In comes a blouser weighing in at about 300 plus wearing the wife-beater shirt. He stands up in front of you holding the pole. All you can see and smell is SWASS.
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