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.
A tree that grows from ones anal cavity.
Dj: Dude, does Jeff have an Anal Tree?
Devyn: I believe so.