The phrase comes from the 1980s anime and manga Fist of the North Star, where martial artist Kenshiro tells opponents they are already dead after striking their pressure points. Decades later the line resurfaced online in the late 2010s as a meme format, usually followed by a shocked nani reply and a delayed explosion or defeat. Its deadpan delivery made it easy to reuse in anime edits, gaming clips and parody fights, and the misspelled shindichu spelling still circulates on soundboards alongside the correct shindeiru version.