Cheerio has long been used in British English as a friendly way to say goodbye, and that familiar, slightly playful tone is what keeps this short clip useful online. Creators tend to use it as a quick sign-off rather than a full line of dialogue, pairing it with exits, farewells and joke endings in short-form video. Its brevity is part of the appeal: at well under a second, it can close a moment without slowing the edit, and its clear, recognisable word makes the joke land even for viewers who only catch the end of a clip.