Psycho
Definition 1 of 3
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Figurative Usage
Often used non-literally to describe someone acting irrationally or unpredictably without being mentally ill. She went psycho over the surprise party plans.
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Negative Connotation
Using 'psycho' can be offensive; it stigmatizes mental illness. It's unfair to label him a psycho just for getting angry.
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Informal Context
'Psycho' is casual and may not be appropriate in formal or sensitive situations. In formal discussions, use 'person with a mental illness' instead of 'psycho'.