(N) A statement or physical item and or person to hide someone's homosexuality.
Person 1: He says he likes big butts.
Person 2: That's such a lie he's totally gay it must be a closet guard.
Person 1: I heard that he is dating some girl but he is so homosexual and there's nothing wrong with that but ya.
Person 2: Must be a closet guard.
In other words beard