The 'Mer Il Et Fou' meme is a legendary staple of the French internet, originating from the Gamekult forums in 2010. The phrase is a phonetic misspelling of 'Mais il est fou' (But he is crazy), written by a user during a bizarre and aggressive exchange on a second-hand sales site. It became an instant sensation alongside other broken phrases like 'Enkuler de rire' and 'Si j'étais pas là vous seriez vous ?'. The meme is typically used to highlight someone's complete lack of logic, absurdity, or irrational behavior. Over a decade later, it remains one of the most recognizable cultural touchstones of early French web culture, often used as a reaction to nonsensical social media posts.