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Similar to the well known "Swamp Ass" Swank Ass is where a person of whom is wearing fine attire, whether it be suit or dress, has built up enough sweat in the lower region to rival that of The Sundarbans Swamp Delta. (That's a massive fucking swamp, for your info)

See: Swank: stylishly luxurious and expensive.
See: Ass: a person's buttocks or anus
"Care to dance Jeffery?"
"It appears I can't Madam, my motions are inhibited by a gruesome case of swank ass!"
by SM00R July 08, 2014
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