Cuco circulates as a short user-uploaded meme clip rather than a line tied to a widely documented film, show, or song, so its appeal comes from how easily it can be reused. At just two seconds long, it fits the rhythm of short-form video, where a single word can act as a tag, a greeting, or a joke on its own. Editors tend to use it sparingly, letting its brevity do the work, and that restraint has helped it stay useful as a small, repeatable reaction instead of a longer catchphrase that quickly wears out.