Wen someone can’t think correctly or is plain out ignorant. Wen people say they are mental, it means that they are being stupid on purpose or not on purpose
Newton: awqofwkfn
Caitlin: Ur kinda being mental rn
by Kaytlin Savoie March 12, 2019
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Derives from the adjective temperamental: a person used to sudden changes in mood.
Because Americans can't spell, the word has been shortened to the last two syllables, but everybody has forgotten about the original spelling. That's why shortening words is always a bad idea.
"Hey, that guy down there is so temperamental."
"Is he what? Speak English, man."
"I said he is TEMPERAMENTAL."
"Oh yeah, he is mental all right!"
by Antidogma September 17, 2011
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Definition: A particular attitude or way of thinking, especially one that you think is wrong or stupid.
a get-rich-quick mentality.

I can't understand the mentality of people who hurt animals.
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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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