The jingle comes from McDonald's I'm Lovin' It campaign, first launched internationally in 2003 and built around a pop song of the same name. Its five note ba da ba ba ba ending became the part everyone remembered, surviving long after the full advert faded and turning into shorthand for the brand itself. Online, creators reuse it for food reveals and parodies alongside other fast food sounds like the Taco Bell Bong, because a two second hook can set up a whole joke without any explanation needed.