This is a generic comedy sound effect rather than a line from a film, show or viral creator, so it has no single original source to trace. Pairings of burps and farts have long been a staple of slapstick, cartoon sound design and playground humour, and short clips like this spread through soundboards, meme pages and video editors who need a quick gross-out punchline. It stays popular because the humour is universal and instantly understood, with no language barrier, making it easy to reuse in pranks, reactions and short-form videos year after year.