definitions of hardcore music are widely different, so this definition is meant as a guide. hardcore did originally grow out of punk somwhere along the line in the 80's. and when i say punk, i mean punk in the ballpark of the Misfits. it began to stand on its own in the early 90's with a few pioneering bands. these early bands were very unpolished, but people looking for the heaviest sound possible became the first fans. throughout the 90's, the line between hardcore and metal thinned, because at the same time some metal bands were also finding a heavier sound.
now skip ahead to the present. at this point, that heavy metal/90's hardcore gap has been closed. however there is a new barrier. everything changed when bands like Terror, Hoods, and Madball started hitting the scene (for lack of a better word). there is no denying the difference between Terror and Unearth. now that awful term "metalcore" has come about. Unearth leans sounds sort of hardcore, but they are metal. Terror is 'straight up' hardcore. kids who listen to Terror know that what they listen to is heavier than what Unearth kids listen to. so as far as they're concerned, Unearth IS NOT hardcore. so now there is 'hardcore' and there is 'real hardcore' or 'straight up hardcore'. THERE IS A DEFINATE DIFFERENCE BETWEEN THE TWO STYLES OF MUSIC.
most fans of 'straight up hardcore' accept and like 'hardcore' music, but dont like it being called hardcore. and they dont like 'hardcore' kids trying to act tough, because they know the music they listen to is tougher. so as much as i am against terms like "metalcore" it is probably a good idea to start using them because of the difference between the metal side and hardcore side.
there is no 'hardcorest' music, just hardcore. if something more hardcore comes along, then that becomes the definition of hardcore. thats why bands like Terror are taking the term for themselves with little opposition; because they are right to. when critics hail their album saying "this is what hardcore is supposed to sound like" there is little arguing that its for real.
Zao (most metal side of what is called hardcore)
Unearth (a blend of hardcore and metal that leans very much on the metal side)
Remembering Never (a blend of hardcore and metal that leans very much on the hardcore side)
Terror (doesnt get more hardcore than this)
by Chadster November 26, 2005

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Extreme. Usually followed by the word porn. Hardcore porn is extremely explicit, graphic pornography.
Threesomes, wheelbarrow position, ect.
by Greasy_Wog_Dude March 25, 2005

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Type of punk rock that relies on heavy, rapid-fire delivery.
The Dead Kennedy's IN GOD WE TRUST, INC. EP relies mostly on old hardcore riffs rather than the snazzy hooks the band is best known for.
by Sooper! June 09, 2002

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To get extremely into something. Usually used in the contex of doing something however can include being used as an adjective to show extreme intensity.
I went so hardcore at the chicken last night it was great!
by GingerRepresent March 10, 2015

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1.) a musical genre, the in-between of punk and metal. Hardcore is NOT the music of the pig squealing myspace whores with scene haircuts, though many believe it to be so. Hardcore music typically consists of simple power chords repeated in variations, simple yet loud drums, and a vocalist yelling, not screaming, about either how straight-edge he is, or how straight-edge he isnt. hardcore is NOT abreviated "hxc" and is not spelt hardxcore. Hardcore fans typically wear camo shorts or tight black pants, black shirts of their favorite bands or funny things (like the "spread the joy" shirt from locoroco, not a "how to win at videogames" shirt you bought at hot topic while you were buying your sister new make-up to replace all the eyeliner you stole from her), and occasionally a bandanna around their head, not their neck, and PUMA, NIKE, ADDIDAS, or VANS shoes. Hardcore fans do not wear suits or ties, do not cross-dress, and do not think its cool to kiss guys, even if they're anti-homophobic.

2.) an adjective to describe something done that most people do not have the balls to do.
1.) "Mickeys crew is a hardcore band"

2.) peeing on your friend's sister because she stole your money, windmill kicking your refridgerator open so hard that the container of milk flies out of the door-shelf and into your hand, then ripping the lid off with your teeth and downing all 2 gallons in a single sitting just so that your little brother won't have any milk for his cereal when he wakes up.
by krevin April 23, 2007

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A style of rock that originated as a variation of punk rock in the late 70s/early 80s. This variation was a harder, heavier version of punk. It is a largely underground genre of rock. Most of the greatest hardcore bands were in the mid-80s.
Rise Against is an example of modern hardcore, whereas Atreyu is mistakenly labelled hardcore.

Black Flag was one of the first hardcore bands.
by HrdCrBss June 19, 2005

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Hardcore is a term used to justify some dislike. This term is often used by those who are not "hardcore" but want others to believe they are. Bands are often critized for being "not hardcore" because they are vastly more successful than the people bitching about them.
Steve: That band sucks ass they arn't even hardcore.
Brian: Your just pissed cuz they don't live in their parents basement anymore...like some people i know. (looks at Steve and winks)
by kainatav November 19, 2007

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a convict who looks like a gay pornstar version of mario
oi hardcore, stop doing the plumbing and start fucking luigi
by deborah 69 March 26, 2011

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