Bruh began as informal slang for brother before the drawn-out spoken version became a staple reaction in online meme culture, where a single flat utterance could sum up disappointment better than a full explanation. It spread through short-form videos, reaction edits and gaming clips, where creators used it as a quick punchline after fails, awkward pauses and anticlimactic reveals. Its staying power comes from that simplicity: the sound is instantly recognisable, easy to place, and works across languages and contexts without needing any setup.