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Knee - ass or Knass: Knee plus extra thigh meat drooping down, making it look like a fatty ass. Often spotted below the hem line of a mu-mu, worn by a two-ton fatty. Can be either man or a woman, young and old.

Sudden urge to stop eating food crosses your mind once you spot the pocky marked knee - ass
1) Good Lord, check out them knasses on that fat broad !

2) Sheila, having finished her deep fried "whole turkey-on-a- stick" from the fair, started to pick off the crumbs out of the crack of her knass and ate it. Her greasy fingers then pushed the button on her motorized Rascal scooter and it slowly moaned into motion....towards the sunset
by knasskrack June 03, 2011
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