psycho
noun /ˈsaɪkəʊ/
/ˈsaɪkəʊ/
(plural psychos)
(informal)- a person who is mentally ill and who behaves in a very strange violent way
- In his new film, he plays the part of a crazed psycho.
- Don’t let him drive—he’s a complete psycho behind the wheel!
Word Origin1930s: abbreviation.