Mental 

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

Mental by Kaytlin Savoie March 11, 2019

Mental 

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!"

Mental by Antidogma September 17, 2011

Mental 

A retard/sped that has disabilitys in the brain.

Matthew minun is a mental

Mental by Megafatboionabike69 May 10, 2018

mental 

stupid, dumb, idiotic (from mentally retarded, derogatory)

That kid is so mental. He makes Homer Simpson look smart.

mental by Light Joker April 8, 2006

Mental 

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"

Mental by T.137 September 14, 2020

Mental 

relating to a disorder of the mind.

Used to refer to people with issues.

Felicity is absolutely mental.

Mental by Anyonekindofman October 18, 2018

mental 

Used by neds, well-respected, cool. See also sound

mental by He who shall not be named July 15, 2003