The phrase goofy ahh comes from online slang for goofy ass, softened for memes and short videos. Clips using a deliberately silly, high pitched voice spread on TikTok, YouTube Shorts and soundboards as a shorthand for something stupid in a funny way. This hello guys version became a reusable intro sound because the rising pitch signals a joke before anything else happens. It is still used because it is short, recognizable, and works without any visual context.