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See also: psycho-


Alternative forms[edit]


Etymology 1[edit]

Clipping of psychotic and psychopath +‎ -o (person with characteristic).


psycho (comparative more psycho, superlative most psycho)

  1. (colloquial or derogatory) Psychotic, or otherwise insane.


psycho (plural psychos)

  1. (derogatory, slang) A person who is psychotic or otherwise insane.
    The loony bin up on the hill is full of psychos.
    Synonyms: freak, loony, nutcase, wacko
  2. (derogatory, slang) A person who acts in a bizarre or dangerous manner.
    She complained that he was a psycho for driving at such a high speed in heavy traffic.
    Synonyms: creep, freak, loose cannon, weirdo
The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.

Etymology 2[edit]

Clipping of psychology.


psycho (uncountable)

  1. (informal) A class, at a college or university, in which psychology is taught.
    I've got anthro, socio, lunch, and psycho.