The name refers to Reggie Kray, one of London's infamous Kray twins, whose calm, understated manner has made him a popular figure in gangster films and crime edits. As a short soundboard clip, this disappointed line has circulated mainly as a reaction sound rather than a viral catchphrase, passed between meme editors who want a dry, understated response to a letdown. Its appeal is its restraint: instead of an exaggerated outburst, it gives creators a quiet way to signal that something simply was not worth the hype.