The feeling of utter discomfort one gets from a combination of eating spicy or hot food, making a torturous bowel movement, inadequatly cleansing their butt hole and or crack, and being so hot, that one sweats in the crack of their ass, causing a witches brew of catastrophic proportions in the rectal area. Taco ass can be further irritated by chafing from activity(i.e. walking,running, etc.), or chafing from being extremely fat.
by Samphx December 05, 2006