Self-appointed authority to make someone annoying go away. Gleaned from a similar phrase used by the cool "Bailiff Byrd" from the "Judge Judy" show.
Girl: What are you doing? Does this make me look fat? Can I bitch at you about all my girlfriends that I hate? Are you gonna just lie there all day and watch TV? Wanna go to the mall?
Guy: Thank you, you are excused, you may step out.