If you play in any Asianserver, 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!