Bruh became common slang for stunned disbelief long before editors turned it into a reusable reaction clip. As short-form video grew on Vine, YouTube and later TikTok, the bruh sound was cut out, saved and reused as a standalone punchline that anyone could drop over a fail. Its popularity comes from how universal the reaction is, with no setup or context needed to understand it. It remains a staple of meme compilations, gaming edits and reaction videos because one flat word instantly signals that something dumb or disappointing just happened on screen.