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Potato Mashing 

When a potato, butter, and milk are inserted in the mouth or anus and then mashed with an erect penis.
Mark came over to do some potato mashing before dinner.
Potato Mashing by Brown Toothbrush January 15, 2016

Mashing the potato 

Mashing the potato is when a girl vigorously thrusts a huge dildo inside of her vagina.
Damn girl, I'm so sore from mashing the potato last night!