stupid, dumb, idiotic (from mentally retarded, derogatory)
That kid is so mental. He makes Homer Simpson look smart.
by Light Joker January 13, 2006
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When someone is more mental Crazy \ weird than another.
Emma is mentaler than Alex.
by Kamy123 April 10, 2017
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Adj. A word used to describe an individual who does something dumb, or so stupid that they should be considered (or are) mentally ill or retarded. Can also describe someone who is just dumb in general or makes bad decisions all the time. Or, it can be used as a noun to describe someone who is ACTUALLY mentally ill. However, this can be considered offensive or derogatory so use at your own risk. Lastly, it can be used as an adjective to simply describe something that's crazy or mind-boggling.

Synonyms: dopey, dumb, stupid, retarded, having a rush of sh*t to the brain, insane, weird, mind-boggling, wack
Antonyms: smart, wise, mentally sound
1. "DUDE SHE JUST TELEPORTED THROUGH A WORMHOLE, THAT'S SO MENTAL"
2. "Billy just ate his own poop thinking it would be nutritious, he's such a mental"
3. "Johnny just had an autistic breakdown in the middle of class today and took a deuce in the middle of the classroom, he's such a mental"
by T.137 September 14, 2020
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More mental than it was before
Damian said "..an egg and brick race on Spoon Lane would be well mentaller than an egg and spoon race on brick lane"
by Mikey 456 January 15, 2009
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relating to a disorder of the mind.

Used to refer to people with issues.
by Anyonekindofman October 18, 2018
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The act of thinking something through in your mind, usually a phrase or sentence, before actually saying it. This is usually advised by someone when a person starts spurting out random thoughts that make absolutely no sense, and add no value to the current conversation.
Guy 1: Sometimes for to being smarter, is for to being deader.

Guy 2: Dude, first you've got to mentalate it, then put it out.
by C. Scully July 29, 2008
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Fake mind-reading that celebrities such as Derren Brown practice on TV to look impressive, otherworldly, or mysterious, when it's all just psychology and not really that good.
That Derren Brown off the telly does mentalism to make himself look magic - what a cunt!
by TheHeianAlien August 22, 2019
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