If you play in any Asian server, you would hear this term frequently which means that you, or other players are terrible in the game or they are purely insulting you.
girl #1: ?Juan fue a la clase hoy?/ Did Juan go to class today?
girl #2: No, el chico bobonunca asiste su clase./ No, the stupid boy never attends his class.
girl #1: !Que bobo!/How stupid!