The phrase comes from an older French expression built around the sou, a small coin, where four sous meant a very modest amount of money. Online, the clipped line has become a compact reaction sound rather than a literal comment on price. French speaking creators reuse it in short videos, streams and group chats whenever a tiny spend, a lucky find or a lopsided exchange needs a quick verdict. Its brevity keeps it flexible, so it survives as a spoken meme even without a single famous scene attached to it.