The 'URETHRA!!' meme is a popular internet malapropism where the word 'Eureka'—the Greek exclamation for discovery—is intentionally and incorrectly replaced with the anatomical term 'urethra.' This joke typically features a character or a simple stick figure experiencing a sudden 'lightbulb moment' of realization, made absurd by the phonetic misspelling. It gained significant traction within ironic and shitposting communities on platforms like TikTok and X (formerly Twitter). The humor relies on the juxtaposition of a profound intellectual breakthrough with a crude, misplaced word, often used to mock one's own stupid ideas or to lean into a chaotic, 'low-IQ' persona for comedic effect.