Pipe gravy Share definition Flag pipe refers to penis and the "gravy" is the stuff that comes out, or semen "That chick's has such a stinky fish taco, I had to load it up with pipe gravy just so i could eat it!" Pipe gravy by r-dog September 22, 2006 0 0 Get merch Get the Pipe gravy mug. Buy Now — $32.95 See more merch