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Alkaline Earth Metal 

Any element of the periodic table which is in group 2.
In order of proton number, Beryllium, Magnesium, Calcium, Strontium, Barium and Radium are all Alkaline Earth Metals.

They are characterized by all having 2 outer-shell electrons (two electrons in their valence shell), alas their placing in group 2 of the periodic table.

They are all silver coloured, soft metals which react readily to form ionic compounds.

The name 'Alkaline Earth Metals' is derived from the fact that the oxides formed by the elements in this group produce basic Alkaline solutions, and the melting points are such that the elements remain solid (Earths) in fires. Alkaline Earth refers to the oxides themselves.

x + 2H2O --> x(OH)2 + H2

2x + O2 --> 2xO
2xO + 2H2O --> 2x(OH)2

Where x is an Alkaline Earth Metal.
Both processes are relatively efficient unless you consider Hydrogen, which is produced in the first, to be a waste product. The second process only produces the hydroxide.
Magnesium is an Alkaline Earth Metal - it, and its oxide, react with water to form a basic alkaline solution.

Mg + 2H2O --> Mg(OH)2 + H2
Magnesium + Water --> Magnesium Hydroxide + Hydrogen

2Mg + O2 --> 2MgO
Magnesium + Oxygen --> Magnesium Oxide
2MgO + 2H2O --> 2Mg(OH)2
Magnesium Oxide + Water --> Magnesium Hydroxide

The electron configuration of Magnesium is 2,8,2 - two electrons in its outer/valence shell
Alkaline Earth Metal by Aconymous November 15, 2009

Metal Head 

Kay, I'm sick of looking at the difinitions of how a metal head lives, that's like trying to describe how to make a cake. A metal head is someone who listens to metal. That's all there is to it. You need not to dress a certain way to be a metal head, this isn't MTV, you feckin clowns. You don't need to wear hoodies or ripped jeans and have long hair to be a metal head, you could shop at JC Penny and still listen to metal. By stating a lifestyle of a metal head, just makes it a potential fad. 'Metal Head', like any other subculture is just a title.
lmao, how do you use an example for a metal head?

'metal head': oh dude, today I dropped out of school and smoked some dope while listening to judas priest.

IZ DAT VHAT Y0V WANT ME T0 ZAY!??!?!
Metal Head by SquidMonkeyz January 3, 2006

Mentally deranged 

unable to behave and think normally, especially because of mental illness
mentally deranged
a deranged attacker
At first I thought he was deranged.
The plan seemed to be the product of a deranged mind.
You Mentally deranged i had your back.
A substance that most coins are composed of with the exception of the wooden nickel. Paper clips are also made of metal.
Quarters are metal.
Metal by IdiotHunter January 18, 2009

Metal up your ass! 

(Reffering to people who don't like metal.) One gets overwhelmed with metal until they bow down before the masters.
Jon - I think metal is stupid, all there is to it is just noise and screaming.
James - Metal up your ass faggot!!!! You have no idea what your talking about, and no idea what metal is, or any clue as to what it's all about. Fuck you and fuck your opinion cuz you are fucking gay!!!!

Metal Fan 

1. Somebody who likes the music of the 'Metal' genre of music.

2. A device used for cooling, usually oneself. Metal fans tend to be more of the industrial variety, i.e. larger and more powerful.
I'm a big Metal fan. I like the classics, like Led Zepplin, Black Sabbath, Motley Crue, but new stuff as well, like Wolfmother and Children of Bodom.

I'm a big Metal fan, too. *spin* *spin* *spin*
Metal Fan by Stabby Joe July 27, 2010