The 67 kid sound comes from the wider 6-7 meme that took over short-form video feeds, where the numbers themselves became a running joke detached from any single meaning. Creators began lifting the kid's chant for edits, sports clips and reaction videos because its energy is instantly recognisable even to viewers who have not followed the original trend. Its short length makes it easy to loop or drop into a punchline, and that repeatability has kept it circulating long after the first wave of posts, especially in gaming and sports edits.