Often believed, by those who don't understand the term's origin, to be spelt (or spelled, for the American audience) 'sike'.

Deriving from the word psychology, psych is a term used to indicate that whatever the person speaking just said was done so purely to mess with the listener's mind, to 'psych' them out, if you will.
"I hate you... PSYCH! you're awesome!"
by ThisBitch") July 24, 2015
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To retract your previous statement, in an attempt to fool the person you're talking/chatting to. Also see sike.
Yeah, I fucked both those model chicks...psych!
by Michael Jackson...psych! December 01, 2004
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A TV show about a guy named Shawn who fakes being a psychic (he has a near perfect memory) to avoid going to jail and ends up working as the Santa Barbara police station psychic.

Characters:
Shawn
Gus
Jules
Lassitor (Lassie)
Psych quotes:

Shawn: Good morning, detectives. Collecting Money for the Policeman's ball?
Lassie: We don't have balls.
Shawn: ... I honestly don't have a response to that.

Shawn: Remember, Dad. Treat a woman like a person, then a princess, then a goddess, then a person again.

Shawn: Gus, don't be exactly one half of a black forest ham.

Shawn: How can you tell someone's a compulsive liar? Well, apart from their pants being on fire.

Shawn: Gus, don't be a rabid porcupine.

Shawn: Gus, don't be an incorrigible Eskimo pie with a caramel ribbon.
by Pink striped panda bears May 08, 2011
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A slang term used to defame a person after they have been persuaded to believe a false truth.

The modern "Mindfuck" could be considered to convey similar meaning, as "Psych" may be interpreted as "psychologically fucking" with a person.
Johnny: "Hey dude, Vikrum was making fun of your mom because of her breast cancer"

*Eric fights Vikrum*

Johnny: "Yo.. Psych!!!!"
(Vikrum only offered his condolences, and was unjustly beaten for a false crime)

Other variations include "Sike", and "Syke", but it is generally accepted that the term is spelled "Psych" (Based on the Greek word for "Soul."
by Suede_Enema February 10, 2012
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The nerdy way of writing sike
Nerdball: Did You Hear What Happened In Math Class?
ILOVEMATH: Erm, No? What? Tell Me
Nerdball: The Final Exam Was Changed To Friday
ILOVEMATH: *GASP* Are You Serious? I Studied For Hours!
Nerdball: Psych!!
ILOVEMATH: Don't Scare Me Like That!
by Maybelline July 12, 2005
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Main Entry: psyched
Variant(s): also psyched /'sIkd/
Function: transitive verb
Inflected Form(s): psyched;
To be excited or pumped up about something.
I'm soooo psyched about the party.
by random hero June 25, 2003
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To fake someone out. To lead someone on and then to immediately decline an ending.
You: Yo i was with this hot piece of ass last night.
Me: Really? Who was it?
You: Psyche! Like i could get with a hot piece of ass?!
by Urban Dictionary October 11, 2004
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