dress: tight, faded fashioncore band shirts (most likely to have the band name in front of a pool of blood) tight, faded/ripped jeans that cost way too much, bandana around neck or mouth, white studded belt.
appearance: shaved head/mid length hair covering eye, stupid looking tunnels in earlobes the sixe of your pinky, lip and/or eyebrow piercings optional.
music: Usually whatever faux metal/hardcore band it's cool to like at the time. Nowadays, it's Norma Jean, Underoath, Atreyu, etc.
dance: Hardcore dancing (Swinging your arms and legs around in a vain attempt to look HxC)
attitude: An air of great superiority due to their apparently "flawless" taste in music and fashion.
Screen name: includes too many X's, words like "gun", "bang", and "kill". Often including their current favorite band's name.
Known to take oddly angled myspace pictures that all look the same, edit them in photoshop, then post 20 of them on their HxC pimped out Myspace.