N. One who displays violent or anti-social behavior, often attributed to mental instability or personality defect.
Jim is known as Sergeant Death because he's a total psycho.
by Naughtius Maximus May 08, 2005
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a deranged and/or psychopathic person who is a mentally ill or unstable person. also see psychopath.
psycho: "whoo hoo hoo hoo! im a fucking, mentally ill psycho!"
me: "you fucking sound like Tigger!"
psycho: "that's T-I double Guh Er!"
by like, dude! May 29, 2003
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An over-the-top psycho.
Andy's cousin Kim is a p-sy-cho.

Beth started screaming at me like a p-sy-cho.
by Psycho Beth November 30, 2011
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a) a psychotic, someone suffering from a from of psychosis
b) Alfred Hitchcock horror masterpeice psycho (1960) accredited with signifying the birth of the slasher movie
c)a psychobilly someone affiliated with psychobilly culture, fashion and music
a) he killed his mum, he must be a psycho
b) have you seen psycho, Norman Baites kills his mum
c) he killed his mum and has a flat top, he must be a psycho
by Tom Rowsell May 30, 2007
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