A temporary attentiveness of the brain to the outside world when engaged in intense gameplay. Usually the victim uses easy quick words to get the person thats talking to them away faster.. Also very dramatic when the an event occurs (i.e. winning or losing)
Friend 1: Yo man im usin your bathroom
Friend 2: Dont even bother talking to him.. he is gamer attention deficit.
Friend 1: Wheres the toilett paper?
Friend 1: Nevermind, found it
Gamer: FUCK YEAH!