abbreviation for Midwestern Ass Disease. An affliction which is rampant throughout the Midwest and particularly the Detroit area in which a girl's ass is much larger proportionately than the rest of her body. Possible causes of this disease are the cold winters, and a total lack of walking.
She looked good from the waist up, but she had a bad case of M.A.D.
by majawe September 25, 2005