Here's the real definition:
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Someone who listens to or will listen to "ANY" metal at all regardless of how lame , gay or shitty it is , how sucky it is , how posery it is , how bad it sounds , how attrocious or horrid or retarded or gay the singing or vocals is , or how bad its message is or how pointless and stupid the lyrics are.If you find any of these people's taste in music suspect they will just claim that you don't know metal or that you just don't understand it because you are mainstream and therefore you don't understand how underground it is.A metalhead is afraid to call any metal bad.In their eyes every metal band that has ever existed is good.That's why you will find most listening to shit music like GnR , Motley Crue , Iron Maiden , Mercyful Fate , Slipknot or Lamb of God unashamedly rather than admit that they suck.

The truth is metal heads come in all shapes and sizes. Some strictly hang out with each other, while others hang out with preppy kids.

When I mean metal head though, i mean people who listen to real metal not System of a Down, Slipknot,etc...

One thing is for sure as everyone here has already stated...never ever pick a fight with one. Nothing worse then a kid with metal/adrenaline pumping through there veins coming at you. They will not stop and they will feel no pain.

metal heads go by what's popular and goth and give lots of thumbs down to anyone unpopular who takes a shit upon their fag-goth pussy shit noise wuss music

a metal head is nothing but yet another pussy conformist little fashionista bitch who follows whatever the crowd says is cool

any metal head will like tons of shit bands

old-skool Rockers weed out the shit and only love all of the really good shit and we say whatever the fuck we want when we want and don't conform to what the man is selling

gay ass trends = brainwashing

real shit has staying power and isn't just some fetishey bullshit for braindead city tards with aids

When a male receives oral sex from a partner with braces.

A person who is desicated to metal. Doesn't matter what the person looks like or acts you probably wouldn't be able to pick a metal head out if a crowd. Not to say that the people who walk around with band t-shirts and jeans are not metal heads most metal heads don't openly show they are metal heads until you hear what they listen to or ask them

Metalheads, love heavy metal//hardrock//Other types of music.
A classic metalhead stereotype is that metalheads are satanic, not true. But, some metalheads are satanic. This isnt the worst stereotype out of all the cliques.
Metalheads are also known to add crazy things to their wardrobe ((most people wouldnt even think about doing this. Adding spikes and studs, chains and leather. but, some metalheads do not live up to what other people expect them to look like. For example, people think metalheads are super violent, not entirely true. People think metalheads are not friendly, not entierly tue. I think metalheads are super cool and really sic!!

Metalheads are fans of the Heavy Metal genre of music. Most are usually defined by wearing denim, leather, band shirts and having long hair, though this is not compulsory to be a metalhead. Stereo-types have emerged of the metalhead and while some do hold truth for many, many metalheads, they might not be true for some. For instance, the pre-conception that all who listen to metal MUST be satanic, is a misconception. Though there do exist those who do follow satanic practices, most metalheads tend to be atheistic in their beliefs, though many metalheads can still be seen following Christianity or other religions.

Personalities vary, but the vast majority of metalheads are honestly great people, who are mostly easy to get on with. Some tend to be argumentative, defending their opinions with some vigor and if you get on their wrong sides, it is often they are quite confrontational. However, they are mostly nice people. They are also incredibly passionate about their music, with it becoming a large part of their lives, in both fashion and attitudes. This does come with a warning, in that a huge majority are very defensive if their music is insulted and will have no problem schooling you on just how badass heavy metal is. If curious about the music, just ask them. It is guaranteed that many of them are experts in their field.