NHWMF Share definition Flag Acronym for "No Hand Washing Mother Fucker." As Dave entered the men's room, he saw NHWMF (aka: Joe) leave the stall and head straight for the door. NHWMF by PWDAD June 26, 2009 0 0 Get merch Get the NHWMF mug. Buy Now — $32.95 See more merch