Top Definition
Performing anal sex whilst using mashed potatoes as lubricant.
Guy 1: I didn't have any lube last night, so I used my leftover mash taters.

Guy 2: A Mashed Potato Butt Fuck? Is that safe?

Guy 1: Sure.
by Xzurii December 12, 2009
5 Words related to Mashed Potato Butt Fuck

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