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A person who, or organization that, is so obsessed with something that they believe it to be the only right/correct/proper/acceptable thing, believes that their way is never wrong nor does anything wrong, believes all other ways are wrong/evil/misguided/unacceptable and seeks to shove their belief down your throat because they believe you are in need of being educated, converted, saved, etc. They are always close-minded and unable to think for themselves. They simply follow and try to spread whatever screwed-up ideology they were too weak-minded to save themselves from.
That guy's a psycho-patriot.

He's a psycho-american.

They're psycho-christians.

I have psycho-parents.

That's a psycho-religion.

We don't engage in psycho-politics.

Disclaimer: Not all patriots, Americans, Christians, religions or parents are psycho. They were simply used as examples because some of them are psycho.
psycho- by Name: Anonymous August 19, 2008
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A person who don't cry when mufasa dies in the lion king
do not ever watch the lion king with a psycho. One of you will not survive the experience
psycho by Sabronna February 29, 2016
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.
Psycho by Naughtius Maximus May 8, 2005
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!"
psycho by like, dude! May 29, 2003
me and all my other personalities
psycho by Anonymous May 26, 2003
"oh no! the psycho is knocking at my door! I told him it's over but he ain't gonna leave me alone!"
Psycho by refresh button June 22, 2008