The line comes from Michael Jackson's Billie Jean, released in 1983, in which the singer denies that a child is his after being pursued by a woman claiming he is the father. The full song became one of Jackson's most famous hits, and this short phrase was later clipped for soundboards and short-form videos. Online, creators turned it into a quick, instantly recognisable way to reject blame, ownership or responsibility, which is why it keeps appearing in reaction edits and comedy skits years after the song itself.