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1. Of or relating to psychosis or psychoses, particularly behaviour associated with them. Psychotic behaviour occurs when a person is suffering psychoses, which may be the result of a chronic illness (classically schizophrenia) or very transient in which case it is usually caused by intoxicants. In any case, "psychotic" by definition means "of or relating to psychoses" therefore only behaviour that is due to a psychosis is truly "psychotic" by extension. A psychosis represents loss of contact with reality; it may or may not include delusional, paranoid or disorganised behaviour. 2. Informal and erroneous, though by far the most common lay usage. Refers to extreme behaviour that appears exaggerated, dangerously violent, or motivated by extreme rage. Is usually frightening to observers.
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