The line comes from South Park, where Eric Cartman adopts it while acting as a hall monitor and using his tiny bit of power to boss other children around. The phrase quickly became one of the show's most quoted catchphrases, repeated in later episodes and turned into a shorthand for fake authority online. Meme creators still use it because the joke needs no setup: one demanding sentence instantly paints the speaker as self-important, petty and convinced of their own importance.