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Its the act of stuffing a condom into the lips of a vagina but not really entering.
Joe: Hey, did you actually have sex?
David: No, I was just mash-potatoing her.
by Konoyaro Bakayaro December 07, 2015
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2
V. Mash-Potatoing is the process of slamming a semi flacid boner, a.k.a. chub, into the lips of a vagina but not actually entering the vagina.
Billy: yeah i couldnt get it in her cuz i wasnt fully hard but we were still goin at it.

Craig: she was mash-potatoing your dick?
by craiggetshispooholelicked June 21, 2010
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