litter box butt Share definition Flag a butt that attracts cats because it smells like cat poop and they think it is their litter box. Damn, girl! That cat has been following you around all day! He must be able to smell your litter box butt. litter box butt by litterboxbutthole January 29, 2007 0 0 Get merch Get the litter box butt mug. Buy Now — $32.95 See more merch