The phrase comes from everyday Japanese, where nakeru describes something tear-jerking and ze adds a blunt, masculine emphasis. As a standalone clip it circulates mainly as a short reaction sound rather than as a quotation from a show or film, and its original recording is not documented. Its appeal online is its brevity and clarity: in just over a second it signals that a moment has landed emotionally. Creators keep returning to it because it needs no explanation, works across touching, nostalgic and bittersweet edits, and gives a sincere human reaction that music or text alone cannot convey.