When a gamers level of skill decreases due to per-longed gaming session. Usually happens after playing more than 1 and a half hours of on-line multiplayer games, but can sometimes also occur when a player attempts to beat an entire game campaign in one go.
Guy 1: Dude yesterday when i played in your MW2
party YOU SUCKED BALLS!
Guy 2: Yeah by the time you joined my party yesterday, i had gamers fatigue.
Guy 1: WHATEVER!!! n00b
Guy 2: Seriously man, f u!