Clips with this phrasing spread as a general reaction sound on short-form video platforms, where creators reuse short voice lines to comment on other footage. The what are you doing bro line works because it needs no context and fits almost any fail, prank, or strange moment. Editors layer it over gameplay, vlogs, and reposted clips as a punchline, often repeated or slowed slightly for effect. Its popularity comes from that flexibility rather than a single viral source, which is why it still appears in new meme edits.