adjective: A term used to describe the body of a flat-chested woman who has a straight, stocky torso and is overweight enough to have folds of fat. The appearance of her naked body is not unlike a sack of shit, hence the term "shitsack body"
Translated from a Korean term meaning basically the same thing
Shitwack, or shitwhack is the Canadianequivalent of shitload. Less than a fuckton, more than an assload, the Canadian shitwack is equal to 1.2 American shitloads