A term for a girls ass. When a baby is born the baby is thrown at the mothers ass to make sure the infant does not have cancer. Men naturally like women with a fat ass so that the infant wouldn't be harmed in this act and so the infant would hit a fat squishy ass and not a bony dry ass.
Hey bro the chick has a mighty fine Thicass.
by NaughtyTestical72 October 1, 2018
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