Fuck That Guy Share definition Flag Used to tell someone to go fuck themselves. Also refer to Acronym. FTG Kyle and John were eating at a restaurant when Jason, the waiter, stopped by to boast about his flare. Fuck that guy. Fuck That Guy by johniebravo October 2, 2009 0 0 Get merch Get the Fuck That Guy mug. Buy Now — $32.95 See more merch