With no confirmed source, creator, or original context, this clip circulates online purely as a minimalist reaction sound built around the everyday filler word so. At nearly sixteen seconds it is unusually long for a one-word soundboard clip, and that excess length became its main appeal as editors began using it to exaggerate dead air. It spread through short video edits, livestreams, and meme compilations where a speaker trails off, and it remains in use because a stretched filler word is universally understood without any setup or reference needed.