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when something is absolutely insane, or just down right gnar.
That barrel was straight up mental
by Jote September 28, 2005
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2
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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4
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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5
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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7
the way you think, act, or feel about towards things.
person 1: man, he doesnt give a shit about anything.

person 2: yeah, i wish i had his mental.
by placentas February 05, 2017
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