With no confirmed original source, eeku spread as a standalone soundboard clip shared for its instant, recognisable squeal. Short reaction sounds like this travel easily between edits because they need no context, dialogue, or setup to be understood. Users repost it under the simple eeku name, making it easy to search and reuse in memes, gaming clips, and chat reactions. Its continued use comes from that simplicity, as a quick audio shorthand for surprise that fits almost any creator's timing and style without explaining a reference.