psycho

• syko (slang)

• (UK, General Australian) IPA^(key): /ˈsaɪ̯.kəʊ̯/
• (US, Canada) IPA^(key): /ˈsaɪ̯.koʊ̯/

• Audio (AU)

  (file)

• Rhymes: -aɪkəʊ

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

psycho (comparative more psycho, superlative most psycho)

1. (colloquial or derogatory) Psychotic, psychopathic, or (broadly) otherwise insane.
   • 2006, Noire [pseudonym], Thug-A-Licious: An Urban Erotic Tale, New York, N.Y.: One World, Ballantine Books, →ISBN, page 258:

     That psycho jawn had snuck a pistol into the gym while we was practicing and started shooting shit up like she was some kinda hot female action hero.

   • 2018, Ava Max, Madison Love, Tix, Cook Classics, Cirkut (lyrics and music), “Sweet but Psycho”, in Heaven & Hell‎, performed by Ava Max:

     Oh, she's sweet but a psycho / A little bit psycho / At night she's screamin' / "I'm-ma-ma-ma out my mind"

psycho (plural psychos)

1. (derogatory, slang) A person who is psychotic, psychopathic, or (broadly) otherwise insane.

   Synonyms: freak, loony, nutcase, wacko

   The loony bin up on the hill is full of psychos.

   • 2018, Ava Max, Madison Love, Tix, Cook Classics, Cirkut (lyrics and music), “Sweet but Psycho”, in Heaven & Hell‎, performed by Ava Max:

     Oh, she's hot but a psycho / So left but she's right, though / At night she's screamin' / "I'm-ma-ma-ma out my mind"

2. (derogatory, slang, broadly) A person who acts in a bizarre or dangerous manner.

   Synonyms: creep, freak, loose cannon, weirdo

   She complained that he was a psycho for driving at such a high speed in heavy traffic.

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.

From clipping of English psychology.

psycho

1. (Hong Kong Cantonese, university slang) psychology (as a subject)