Duff Child Share definition Flag When both of your parents were the DUFF (dumb ugly fat friend) bred to make you a duff child. eww look at jimmys mom over there with her crocks and moterized cart.. now that I look at her I see why Jimmy is such a duff child Duff Child by false_profit February 16, 2015 0 0 Get merch Get the Duff Child mug. Buy Now — $32.95 See more merch