bitch muffin Share definition Flag sone one who acts like such a bitch (see bitch) that you want to take a huge muffin and shove it up their ass. Marshall stop being such a goddamn bitch muffin! bitch muffin by billy joe bob April 22, 2005 0 0 Get merch Get the bitch muffin mug. Buy Now — $32.95 See more merch