You aint Grizz baby. Used on xbox live and some other gaming sources. This phrase is used to describe snipers on Call of Duty or other games that allow access to a sniper that try to hit ridiculous shots or think there amazing when they usually fail miserably. For more info on the man himself see: zzirgrizz
Guy 1: OMG I just no scoped someone across the map.
Guy2: Dont lie, YAGB.
Guy1: OMG that guy is so bad I would destroy him 1v1
Guy2: No, YAGB