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A type of food that gives you the same nutritional value had you shoved it up your ass.
Hey, what say we hit Whitey's for lunch?

No way, that's butt food! I can't take it anymore.

by jim6572 December 19, 2006
A g-string that is gobbled up by a bubble but.
epsilon: I used that ass as a pillow.
epsilon: That's buttfood
omoc: What?
epsilon: That g-string just got gobbled up by her but.
by aseomoc October 17, 2011