Bruh started as casual slang for brother before becoming a standalone reaction online in the 2010s, especially in Vine, YouTube and gaming clips. The drawn out bruhhhhhhh version turns that one word into a meme shorthand for a bruh moment, a fail or statement so obvious or ridiculous it needs no explanation. Short soundboard clips helped it spread because the file is tiny, instantly recognisable and easy to loop into edits, streams and group chats, keeping it in rotation long after the original short video formats faded.