The exact origin of this specific "oh la laa" clip is unclear from the available information, but sounds like this are common across meme edits, short reaction videos and reposted soundboards. Its popularity comes from how quickly it signals playful surprise or admiration in under two seconds. Creators keep using it because it fits many formats, from thirst edits to ironic reveals, and it drops neatly into fast-cut videos alongside other short reaction staples such as anime wow.