SxF Share definition Flag Slut Free. Pertaining to not dating, or having to do with girls with no self respect. jon: "Hey bra, what you think of Mary over there, she's so fine." paul: "naw man, she's a ho, gotta stay true to bein SxF." SxF by ChadDOOM May 29, 2008 0 0 Get merch Get the SxF mug. Buy Now — $32.95 See more merch