dud muffin Share definition Flag The opposite of a stud muffin. That guy is a total dud muffin.Are you going home with that guy?Hell no, he's just a dud muffin. dud muffin by K8Poo & LZFingers May 30, 2011 0 0 Get merch Get the dud muffin mug. Buy Now — $32.95 See more merch