butt-foot Share definition Flag The combined smell of nasty sweaty ass & feet. One of the worst smells known to man. Oh my god! What is that smell? Someone has a major case of butt-foot going on! Wash your ass!! butt-foot by BamBamBitches! August 22, 2011 0 0 Get merch Get the butt-foot mug. Buy Now — $32.95 See more merch