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Someone who wipes their ass, but notcompletely. When your ass starts to sweat, you leak the leftovers from your earlier dump
Man it's fucking hot outside, i got the worst case of swish ass ever
by sourdude13 January 13, 2006
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That not so fresh feeling between the cheeks of your ass.

Like when sweat mixes with leftover chunks of shit, and lubricates your ass cheeks.
After Tom ate the bag of Pringles with olestra he had swishass for a week.
by Raziel March 23, 2005
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