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to lack brain cells
01
to act extremely stupid or clueless; often used jokingly online
Slang
What does "to lack brain cells" mean in insult slang?
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.
Examples
He literally lacks brain cells for forgetting the simplest thing.
