butt gravy Share definition Flag when its so hot outside and ur butt sweats and it makes its own gravy man i was working in that factory the other day and it was 106degrees...holy hell..i had some butt gravy going on! butt gravy by hhsbigwile July 17, 2011 0 0 Get merch Get the butt gravy mug. Buy Now — $32.95 See more merch