The clip comes from Tom Scott's video What Counts as a Word, a linguistics explainer about where sounds end and words begin. Its long stretched vowel, written online as aaaaaaajjjjjjjjj, was lifted from that context and reposted on soundboards as a standalone joke. Because the title is just the sound spelled out, it spread as a scream meme that people rediscover when searching for nonsense vocal reactions. It remains popular for its literal premise: a noise that sits right on the border between a sound, a syllable and a word.