The phrase "pants-on-head" is an insult meaning extremely stupid or irrational. The structure comes from the image of someone wearing pants on their head, used metaphorically to suggest total lack of sense or competence. It is informal and often used in online arguments or meme culture, usually in the longer form "pants-on-head stupid," to intensify criticism of someone's reasoning or behavior.

英語での「pants-on-head」の定義と意味

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