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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.
When during a blowjob the female/male giving the blowjob grabs a hold around the ball sac and crushes the balls.
Often done by people with "cbt" fetishes (check wiki) and also dominatrices.
"You cant believe how great it felt when Linda and I tried something new, she really likes Mashing the potatoes. It really spiced up our marriage and felt great."
Clean way of saying "masturbating and watching porn." The tense of "eating" can change depending on context.
Since I wasn't invited to any parties Friday night, I ended up staying home eating mashed potatoes.