The phrase combines two staples of classic wrestling promos, the drawn out oh yeah and the use of brother as an all purpose address. Clips in this style spread on soundboards and in short form video because the line is instantly recognisable even without context. Creators reuse it as a standalone reaction, a stream alert and a meme punchline for moments of exaggerated confidence. Its popularity comes from that flexibility, it fits sports highlights, gaming wins and everyday boasts without needing any setup or explanation beforehand.