Short vocal reaction clips like this spread through soundboards and short video apps because they say what a caption cannot in under two seconds. The ooooouuuuu has no lyrics or context to explain, so editors reuse it across gaming clips, pranks, sports highlights and everyday fails. Its rising, drawn out shape works as a universal cue for amazement, which is why it keeps appearing even without a single famous source video attached to it. The simplicity also makes it easy to layer, loop or cut into remixes.