fatloaf Share definition Flag A typically slightly overweight stocky person who behaves in a somewhat retarded fashion. Referring to a drunken 5 foot tall man who is not particularly bright, you may say "You see that fatloaf over there? Look at the state of that!" fatloaf by Gugu Abubu January 16, 2007 0 0 Get merch Get the fatloaf mug. Buy Now — $32.95 See more merch