One who is mental - first coined by UK sitcom "I'm Alan Partridge" (Episode 5)
What are you doing, you mentalist?
by Mamba July 15, 2003
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Originally a mentalist was an adherent or advocate of a mentalistic school of psychology or psychiatry. Someone who believes that some mental phenomena cannot be explained by physical laws (i.e. telepathy and mind reading).

While a psychic may claim to observe an underlying spiritual reality and report on it, in a process known as a "psychic reading," a mentalist, by contrast, might claim the ability to manipulate that reality in order to create a different manifestation.

The term "mentalist" also refers to "psychic" entertainers whose illusions feature the apparent ability to read minds, foretell the future, and see distant and hidden objects. This branch of magic is referred to as "mentalism".

"Mentalist" has more recently become a tongue-in-cheek insult for when someone is behaving oddly or wackily, thanks to tv series "Alan Partridge" and "The Office".

"Lee Hicks is a mentalist."

"Darren Brown is an amazing mentalist."
by plasmatika September 27, 2005
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In backwater police department jargon:

(1) a soft file wherein the names, addresses and other vital information about people regarded as having emotional, cognitive and/or behavioral disorders are kept;

(2) a soft file containing the names of people who've pissed off police officers to such an extent they have been wrongfully branded as having emotional, cognitive and/or behavioral disorders in order to ensure they'll receive "extra special handling".
Chief Schultz: Do we like anyone for that vandalism at 1 Civic Center?

Deputy Chief Feist: -I don't know, let's consult with the
mentalist and see whom we can start leaning on.
by 100%PTSD/MTBI August 17, 2012
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A person who is mental and proud. The term is not meant in an offencive way and is often used by friends or relatives.
"(sigh) You're such a mentalist!"
by lalalaura_xx January 19, 2009
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A person with a) a mental disorder, b) a penchant for doing things of a dangerous or "mental" nature
Fucking fuck off or I'll fuck you up the fucking A-hole you motherfucking fucker - don't you fucking look at me like that you fucking fuckstick, you think I won't fucking kill you, you unclefucking butfucker. Fuck off. What are you? some kind of mentalist?
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someone who is interested in mental or spiritual practices.
someone who is clearly mad and is not ashamed of it. someone who persistantly defies there mates telling them "don't do that you mentalist"
"I bet you i could jump over that river"
"Fuck off you mentalist!"
"no no no, i rekon i can." <snip> long detailed explanation follows
by TheTalon October 19, 2003
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American Police Procedural TV series aired on CBS, created by Bruno Heller, starring Simon Baker and Robin Tunney.
Person 1: I want to watch the best show in the world
Person 2: Hey, you should watch The Mentalist
by marchfallmraz November 24, 2013
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