WSF Share definition Flag Short for Westside Fornicators, a gang in the Santa Ynez Valley area consisting of White guys, Mexicans, potheads, rappers, and vandals. Bitches know not to fuck with WSF. WSF by The Taker of Dumps September 14, 2012 0 0 Get merch Get the WSF mug. Buy Now — $32.95 See more merch