Little is documented about where this JJJJJJJ clip first came from, and its title gives no source, character or context beyond the repeated letter itself. Sounds like this spread through user soundboards because they are easy to search, easy to recognise from the name alone, and flexible enough to fit almost any silly edit. Its staying power comes from that blankness: with no specific reference attached, creators can reuse it for gaming clips, reaction posts and short memes without the joke depending on a film, song or celebrity.