Definition of psycho in English:

psycho

noun

informal
  • A psychopath.

    • ‘Kleptomaniacs, kitchen drinkers, Fatal Attraction type psychos, obsessive-compulsives, and other problem individuals are usually discovered in this phase.’
    • ‘It's unpleasant, but it's more unpleasant to be faced with true psychos / junkies on the subway.’
    • ‘I don't want to be put in there with a bunch of crazy psychos… I'm not a bad person.’
    • ‘Second, my best friend and crush is being stalked by crazy, murderous psychos.’
    • ‘The speech was basically: men are psychos, Americans are psychos, the Americans want to exterminate the planet, and naked protest will end the nuclear age.’
    madman, madwoman, mad person, deranged person, maniac, lunatic, psychotic, sociopath
    View synonyms

adjective

informal
  • Psychopathic.

    • ‘Next is Melanie, doing that psycho laugh of hers from the old days.’
    • ‘I love blood and gore and crazed psycho killers come back from the dead.’
    • ‘They were scrawny but muscly trashy types, like my in-and-out, in-and-out of prison psycho cousin.’
    • ‘I always thought that those psycho girls who stalked band members and actors were just make believe, until now.’
    • ‘I would come back and watch all my favourite violent psycho movies.’

Origin

1930s: abbreviation.

Pronunciation

psycho

/ˈsīkō//ˈsaɪkoʊ/