This version is best understood as an internet edit of a basic fart sound rather than a clip tied to one clear original source. Creators took the familiar fart with reverb format and reversed it, turning a blunt joke effect into a drawn-out buildup. That small change made it useful for surreal humor on short-form video platforms, where exaggerated timing matters. It still gets used because the backward swell sounds unexpectedly cinematic while the final joke remains obviously childish.