Bruh has circulated for years as everyday slang for a brother or close friend before becoming shorthand online for stunned disbelief. As a short clip, this version spread through meme edits, gaming videos and reaction posts where a single word could replace a whole comment. It sits in the same reaction toolbox as a drawn-out damn or an oh my god, wow response, but it is drier and more dismissive. Its staying power comes from timing and tone, letting creators punctuate fails, bad takes and awkward reveals without pausing the video.