Ms.Mf Share definition Flag Ms.Mf is the abbreviation for Ms. Mother Fucker. It is better to call someone mf rather than bitch. Boy: "You mother fucker!" Girl: "That's Ms.Mf for you!" Ms.Mf by Friend of Ms.Mf October 28, 2011 0 0 Get merch Get the Ms.Mf mug. Buy Now â $32.95 See more merch