Top Definition
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...
by X-Fi6 October 20, 2007

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