STFUOGTFO Share definition Flag Stands for "Shut the fuck up or get the fuck out". Also represented in "STFU or GTFO" or "STFU & GTFO". Guy1: Hey, did you get Halo 3? Noob: OMG liek Halo is for NERDZ Guy2: Dude, STFUOGTFO... STFUOGTFO by X-Fi6 November 6, 2007 0 0 Get merch Get the STFUOGTFO mug. Buy Now — $32.95 See more merch