Bruh began as casual slang for brother before becoming a short, all-purpose reaction word online, used to express disbelief, disappointment or mild shock. Soundboards and short-video creators later added echo and reverb to familiar reactions, making them feel bigger and more dramatic without changing the word itself. The echoed version spread through memes, gaming fails and reaction edits because it fits almost any awkward moment and needs no context. Its simplicity is why it keeps returning in new edits.