noun
a type of hat made out of tinfoil, often associated with conspiracy theories
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Some conspiracy theorists believe that wearing a tinfoil hat can protect their thoughts from being read.
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My uncle swears by his tinfoil hat to block out government mind control.
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I can't take him seriously with that tinfoil hat on his head.
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She always wears a tinfoil hat when discussing politics, convinced that everyone is out to get her.