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.
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Senator Armstrong's 'Nanomachines, son' line from Metal Gear Rising: Revengeance, used as a meme reply for absurd durability and impossible explanations.
This is Senator Steven Armstrong delivering his famous deadpan explanation, 'Nanomachines, son,' in a deep, confident voice with a short pause before 'son.' The clip is just the line itself, cut tight with no music underneath, so the absurd confidence lands instantly. Armstrong says it while shrugging off attacks in a boss fight, as if advanced technology explains everything. That smug, unshakable delivery is what makes it funny — it turns any impossible feat or plot hole into a joke answer that needs no further logic or apology from the speaker.