Makin' Gravy Share definition Flag Makin' Gravy is most definitely the act of defecating, more than likely a wet one. Dude- What have you been doing over there Brian? Brian- Makin' gravy. Dude- Gross, can I have some? Makin' Gravy by Renoryn April 17, 2009 0 0 Get merch Get the Makin' Gravy mug. Buy Now — $32.95 See more merch