The origin of this clip is not documented, so it circulates online simply as a reusable reaction voice line rather than a quote tied to a known show or creator. Short stunned reactions like this spread through soundboards and short video edits because they need no context to understand. The repeated yo framing gives it a loose, spoken feel that suits gaming moments, strange sightings and sudden noises. It stays in use because it captures the first second of disbelief, before anyone has words for what they just saw.