C'est nul is a common French expression meaning that something is rubbish or worthless, and pairing it with Homer Simpson gives a familiar cartoon voice to a very everyday complaint. The Simpsons character has long been used for blunt, exasperated reactions, so the line fits naturally into French-language memes, reaction videos and soundboards where a short dismissal says more than a long explanation. Its brevity and recognisable delivery help it stay useful across gaming clips, vlogs and social edits, especially when the joke is disappointment itself.