Mentalist (derogatory slang)
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Mentalist is used as a derogatory term for someone who is "mental" or insane.
It was first popularised by an episode of Steve Coogan's, I'm Alan Partridge. An extra layer of irony was added to the term when it was used repeatedly in the UK BBC hit The Office, parodying the tendency in office environments for workers to parrot popular comedy sketches and catchphrases.
This definition of the word "Mentalist" is now recognised in the Oxford English Dictionary, although the word has been in the dictionary for some time BP (before Partridge).