The kkkkkkkkkk spelling comes from Brazilian Portuguese chats and comments, where repeated k letters stand in for a fit of laughter, similar to lol or hahaha elsewhere. This nine laugh version circulated on soundboards and WhatsApp groups as a ready made reaction, rather than from a single known show or movie. It is often grouped with other short Brazilian laugh clips like Risadinha de ladrão and quick high pitched hits like Chipmunk Laugh, and it stays popular because it translates a text joke into audio in under four seconds.