NAF Share definition Flag Acronym for NOT a FUCKusually said when there is a serious case of unwillingness! -hey man, would u tap that minger of there? -NAF! i wouldn't touch that shit with a 10 foot pole! NAF by harold1261 December 14, 2010 0 0 Get merch Get the NAF mug. Buy Now — $32.95 See more merch