noob Share definition Flag A word restricted to only 13 year kids who spend their life on Xbox live. Usually used when a kid gets angry and loses a game. Kid1: *Shoots kid2 dead in Modern Warfare 2*kid2: YOU DUMB NOOB! noob by co0ldude124 September 5, 2011 0 0 Get merch Get the noob mug. Buy Now — $32.95 See more merch