Cuffem is a Twitch and Kick streamer known for chaotic IRL and reaction streams around Adin Ross's circle, and short clips from his broadcasts are often ripped into meme soundboards. This nasty fart clip spread in that fan ecosystem as a reusable reaction sound rather than as part of a song or show. Posters title it with extra letters for emphasis, which is why spellings like farttt appear online. It stays popular because fart sounds are a universal prank staple and this version is especially repulsive.