A psycho is someone who has serious mental problems and who may act in a violent way without feeling sorry for what they have done. Some psycho picked her up, and killed her. Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers. Definition of psycho noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Psycho is an informal word for someone who is crazy and frightening, or an adjective to describe such a person. It can also be a prefix meaning of the mind or mental processes. The meaning of PSYCHO is psychopath. How to use psycho in a sentence.
