FG=0 Share definition Flag Fucks Given: Zero. Meant to be used when you want to let the person you're talking to you just don't give a fuck. Alex: So this one time, I was at the--Robb: FG=0 FG=0 by Robb37 September 9, 2011 0 0 Get merch Get the FG=0 mug. Buy Now — $32.95 See more merch