Top Definition
A medical condition which consists of a large mass of fatty tissue below the belt or waistline of an overweight woman. The massive upper vagina is much more visible when the woman wears a belt which compresses her plump form, similar to a rubber band around a marshmallow.
Did you see how much weight Seth's mom has gained? Poor woman has a serious case of Massive Upper Vagina Syndrome (MUVS).
by gyatso January 23, 2009

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