The 'ChatGPT Em Dash' meme revolves around the observation that OpenAI's language models have a distinct preference for using em dashes (—) to structure sentences. As AI-generated content became ubiquitous, internet users and editors began noticing these repetitive syntactical fingerprints, turning the punctuation mark into a 'dead giveaway' for bot-written text. This meme is used to mock students, copywriters, or social media influencers who claim to write original content while leaving in the tell-tale signs of a large language model's stylistic quirks. It captures the modern struggle of distinguishing human creativity from algorithmic output through the lens of a single, long horizontal bar.