The line comes from Fist of the North Star, the 1980s manga and anime about Kenshiro, master of the deadly Hokuto Shinken martial art. He tells doomed opponents they are already dead moments before their bodies give out, and their stunned 'Nani?!' became inseparable from the quote. The exchange exploded as an internet meme in the late 2010s, dubbed over everything from sports highlights to anime edits, and it now sits beside other anime meme staples like the To be Continued cliffhanger and the Za Warudo time stop as instant shorthand for a fight that ended before it began.