The phrase itself is informal French slang for someone not bothering or not making an effort, and as a sound it circulates mainly as a short reaction clip for memes and edits. Because it is only about a second and a half long, it fits easily at the end of a joke, over a lazy character, or as a comment on a video where nothing much happens. Its appeal comes from that direct, unbothered attitude, which translates even for viewers who only catch the tone, making it a handy shorthand for chill indifference in French-speaking meme culture.