fat addie Share definition Flag A person who is grossly overweight but doesn't know it. Fat Addie's also think that they're better than most people giving them an obnoxious quality. "Man, is that a chick?" "No dude thats a Fat Addie" "Oh. Thanks for the heads up." fat addie by Sasas46 September 29, 2006 0 0 Get merch Get the fat addie mug. Buy Now — $32.95 See more merch