The phrase you are already dead is best known online as the English version of Kenshiro's line omae wa mou shindeiru from Fist of the North Star, a 1980s anime and manga series. Paired with a shocked nani, meaning what in Japanese, the exchange became a widely copied meme format in the 2010s, spreading through anime edits, remixes and soundboards. Short versions named for whoever delivers the line keep circulating because the setup is instantly understood, even by viewers who have never seen the original series.