This sound spread as a short reaction clip on meme soundboards and social video, where the repeated brother became a shorthand for oh my god and what the hell moments. The phrasing from tags like whatthehellomg and howyoudoing points to its use as a stunned greeting and a callout at the same time. It stays popular because it needs no setup or context, fits almost any embarrassing or unbelievable scene, and can be looped or trimmed to a single brother depending on how strong the reaction needs to be.