A recognizable writing style parodying how ChatGPT and similar AI chatbots phrase things — leading with a conclusion, organizing points into tidy bullet-like clauses, opening with stock phrases like "of course" or "in short," peppering in emoji, and hedging claims with "it could be said that..." — treated as an instantly identifiable, slightly uncanny register that people now consciously imitate or mock rather than something that just reads as cold.
EXPLAINER
Scripting Japan · original source ↗
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REAL-WORLD EXAMPLE
"このメール、めっちゃチャッピー構文で草。「率直に言うと」から始まってる。"
LORE & ORIGIN
Spread as a meme in early 2026 alongside the mainstreaming of ChatGPT-assisted writing: readers began instantly recognizing AI-generated or AI-influenced text by its telltale conclusion-first structure, formal-but-flat tone, opening stock phrases, and habitual hedging language, nicknaming the whole register チャッピー構文 after "Chappy," a common affectionate nickname for ChatGPT in Japanese online culture. What started as a way to call out obviously AI-written text became its own genre of humor, with people deliberately writing in chappi koubun for comic effect or affectionately defending the style as more than just AI smell.
EQUIVALENT CONCEPTS IN OTHER LANGUAGES
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