F.F.S. Share definition Flag For Fuck's Sake Originally used in Quake, created and defined by team OLD (The Mike's) You just got 'naded by a spammer. A common reply to this might be: F.F.S. F.F.S. by M 2teh C April 17, 2006 0 0 Get merch Get the F.F.S. mug. Buy Now — $32.95 See more merch