The phrase is French slang built around lâcher, meaning to let go, so the line roughly expresses that something will not let up. No clear original film, show or creator is documented for this specific recording, which has circulated as a short standalone clip on soundboards and in meme edits. Its spread comes from its brevity and clear attitude rather than a known source, letting editors drop it into French and international videos where a short, insistent voice line is funnier than explaining the joke.