The phrase is French, a contracted form of je ne vais pas vous lacher, literally I am not going to let go of you. No clear film, show or creator source is attached to this upload, which is titled tk78 jvais pas vous lacher, so its life is mainly online as a shareable voice clip. French speaking users pass it around for its blunt persistence, and others reuse the sound even without speaking French because the insistent delivery makes the meaning easy to guess from context and timing alone.