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A phrase describing any female-female sexual position where the vulva of each female are bumped and rubbed against the other. May also be used to describe lesbian sex, even though not all lesbian sex entails vulva-to-vulva stimulation; similar to "knocking boots" being used to describe sex in general.
I'd like to watch my wife bump muffins with Kate Beckinsale.
by fragglecock February 23, 2011
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