The phrase itself is old-fashioned English, the kind of formal dismissal once used in plays and historical stories to send an unwelcome visitor away, which is why it sounds instantly theatrical to modern ears. As a short soundboard clip it has circulated among creators who want a quick, quotable rejection that needs no explanation. Its appeal is the contrast between the polite, almost courtly wording and the blunt contempt underneath, making it a handy shorthand for telling someone, in character, to leave.