The line comes from Metal Gear Rising: Revengeance, released in 2013 by PlatinumGames and Konami. Final boss Senator Armstrong reveals that nanomachines in his body harden in response to physical trauma, letting him withstand Raiden's attacks. Players clipped the exchange and posted it across forums, YouTube edits, and image macros, often pasted over other invincible characters. It grew into a shorthand explanation for any overpowered ability in games and anime, and the short audio version spread on soundboards because the single line works without the full cutscene context.