English version

psycho in Psychology, psychiatry topic

From Longman Dictionary of Contemporary Englishpsychopsy‧cho /ˈsaɪkəʊ $ -koʊ/ noun (plural psychos) [countable]  informalMPVIOLENT someone who is mentally ill and who may behave in a violent or strange waypsycho adjective
Examples from the Corpus
psychoFor all I knew she might have been a psycho or a girl with a little blackmail on her mind.Flesh-eating psycho played by Sir Anthony Hopkins is back in a slick, camp sequel.These two raccoon-eyed psychos have lost none of their no-holds-barred energy or their penchant for writing catchy melodies.When the psycho is caught, then let go on a technicality, Mom takes matters into her own hands.All his posse friends were psychos, deranged misfits who were cruel for kicks.