The line comes from the Metal Gear Solid series, spoken by Liquid Ocelot, the possessed rival and brother figure to Solid Snake. Their long running rivalry is central to the games, built on repeated confrontations where Liquid refuses to stay defeated. Clips of his most theatrical lines circulated on gaming forums, YouTube edits and soundboards, where the brother shout became shorthand for any rivalry that keeps returning. Its continued use comes from that mix of genuine boss fight drama and unintentional camp, making a serious scene easy to reuse for jokes about unfinished arguments and rematches.