Someone who is a "Celebrity" gamer.
Someone who is known only by how much they dominate a specific title or niche in video games.
Announcer: Who's the next person that wants to take a shot at Fatal1ty (Johnathan Wendel) at a game of Quake 3?
Man @ E3: Are you serious! He knows that game better than I know how to walk. That's suicide, he's a total pwnstar!