The phrase "to lack brain cells" means to act very foolishly, make obvious mistakes, or show poor judgment, often in a mocking or insulting way. The structure is a hyperbolic metaphor where "brain cells" represent intelligence, and "lack" implies insufficient mental capacity. It is informal slang commonly used online and in everyday speech, usually as a sarcastic or exaggerated criticism of stupidity or careless behavior.

What does "to lack brain cells" mean in insult slang?

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to [lack] brain cells

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英語での「lack brain cells」の定義と意味

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