meaning someone who is silly or stupid, usually for attention and in a random or sporadic way, involving nonsensical references and actions. usually violent or quick action involved, resulting in general amusement and hilarity of onlookers.
"hey look, archie's jumping off that cliff while holding a banana!"

"wow! he's mental!"
by arto October 11, 2005
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This phrase has commonly been misinterpreted as the complete opposite of its actual meaning. when someone asks "Are you mental?!" it means that they are asking if you ARE in fact mental and your brain is functioning PROPERLY. In todays society it has been disregarded as a phrase that implies being "mental" is a bad thing, when in fact being "mental" means your brain is working correctly.
John Madden: Are you MENTAL?!

Generic Football Player: Yes actually, I am!
by Davins_Kitchen December 01, 2013
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Usually one with a mental disorder.
Including anxiety disorders, personality disorders,eating disorders, and much more.
Usuaully used as "crazy"
Joe: That hannah in MENTAL!
Tom: what, does she have some eating disorder?
Joe:what? She's just flat out crazy..
by mabbymab December 13, 2009
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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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1) (acronym)Mental Entities Needing Total Attention Lodge

2) Created for the website that later adopted the word "M.E.N.T.A.L"

3) Old piece of furniture, usually a sofa, that goes around eating people

see Bentrix for other words related to this company
1) "i found a cool website..."

2) "hey...look, another cool website, called M.E.N.T.A.L, i wonder why?"

3) "OMG this early piece of victiorian furniture is trying to bite my leg off!"
by Ben Waugh August 10, 2004
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