Someone who edits players and teams on sports games (NCAA Football 09, Madden 09, NBA LIVE 2K9, etc.) and makes every single attribute, of every single player on their favorite team a perfect rate of 99.
Tom: I went over to Bill's house to play madden and I just couldn't beat him. He was unstoppable.
Ralph: I know, the same thing happened to me. He edits the players.
Tom: Wow, what a 99er.