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21.
A derogatory term used, primarily by metalheads, to describe music that is often mistakenly considered metal.

Originally the term referred to nu-metal bands, such as Linkin Park, Limp Bizkit, Korn, Papa Roach and Slipknot. More recently the term can be applied to screamo, emo and metalcore bands such as Bullet for my Valentine, The Used, Avenged Sevenfold and Senses Fail.

The defining feature of such bands is that they make angsty, commercially-orientated hard rock targeted at "rebellious" teenagers.
14-year-old kid with dyed-red shoulder-length hair and black skinny jeans: "I'm a metalhead, fuck the world!"

26-year-old metalhead: "Fuck off kid, you don't know shit about metal! You just listen to some bullshit mallcore. Power metal, speed metal, folk metal, black metal, death metal, thrash metal... those are all real metal genres. The shit you listen to isn't even close!"

14-year-old kid: "Jeez, man, thanks for the lecture you fucking nerd!"
by subcultures+genres May 11, 2012
 
1.
A modern form of music, influenced, but wholly separate from Heavy Metal that incorporates rap, funk, simplified song structures, and subject matter geared towards the teens and youth of America. Topics often include alienation, parental abuse, and "the pain inside." Watch for simple rhyme patterns and a general lack of innovation. The oversaturation of the market with mallcore in analogous to the takeover of glam rock in the late 80s and early 90s as record companies scrambled to make a quick profit. The roots of mallcore go back to Anthrax's "I'm the Man" as well as Faith No More's "Epic." These visible hits which fused metal and rap inadvertently caused a tidal wave. Bands such as Korn and such spinoffs soon began to take over the market with detuned and substandard products. As the style of music overtook a naive fanbase, many bands, formerly true to heavy metal, began to lean towards mallcore tendencies. These bands, such as Metallica, In Flames, and others made their sound more accessible by simplifying their work and adding aspects of electronica, whispered vocals, simple chugging riffs, and taking focus off of lead guitars. This style of music as of late has been decreasing in popularity, as record companies have opted to move on to other styles of music. Most likely the style will experience a revival in the next decade as bands realize they have no money, having spent it in their prime. Revival tours and reunions will be common, and the pain of the past will be experienced once again.
The new In Flames album will definitely be mallcore.
by Lord Worm August 16, 2003
 
2.
derisive term for MTV-created bands who claim to be metal but actually are not. usually consists of downturned guitars, poorly played drums and bass, and teen angst lyrics screamed or rapped over this wall of noise.
korn, limp bizkit, linkin park, slipknot
by abcdefg December 12, 2003
 
3.
Kids who listen to Slipknot and Korn and wear those damn baggy ass black pants with a ton of pockets and chains. Oh did i mention that they are fuking gay?
Omg look i can fit more slipknot and korn cd's in my super mallcore pockets than you can!!!
by Bob December 31, 2004
 
4.
A bastardized genre of music in which the distorted guitars and agressive vocals of hardcore and heavy metal are dumbed down musically and then packaged to be marketable to angst-ridden teens. The name is derived from the "-core" system often used to name metal and punk varients such as hardcore, metalcore and emocore, and is so named because it targets your standard mall-going teens rather than real music enthusiasts, who nearly unanimously dismiss it as garbage. It can be characterized by chugging riffs based around basic (and often no) progression, and angsty yelled or rapped vocals. The lyrical content often complains about the unfairness of teenage situation, parents, school, or in rare cases politics. There is very little place for any musical innovation, and electronic effects and samples have taken the place of guitar solos and the like in 90% of the genre's bands.
"fuck...In Flames turned into total mallcore"
by TheSanityAssassin November 03, 2004
 
5.
Pathetic kids who spend all day at the mall (especially at Hot Topic), reeking of fake angst and despression and talk about how Slipknot is the greatest "death metal" band that ever lived.
You mallcore kids should shut up about stupid Slipknot and pick up a Blood Red Throne album for some real death metal.
by RID June 28, 2005
 
6.
1. Music made for and bought by mall-going teenagers/young adults, characterized by a high level of angst and a low level of sincerity. The term dates back to the late 1990s when groups like Korn, Tool, Limp Bizkit, Slipknot and the Deftones dominated rockradio and were incorrectly labeled "metal" by fans and the news media. In 2001-2002, these "nu-metal" bands took a nosedive in popularity and the metalcore rush took over, thus beginning the second generation of mallcore. While metalcore has more similarities to heavy metal than its precursor, the common aesthetics - angst, faux rebellion and generally repetitive musicianship - remain entact.

2. A style of dress associated with listeners of "mallcore" music. The "nu-metal" years were characterized by baggy pants, pocket chains, dredlocks and long goatees, while the "metalcore" era utilised unkempt hair, thick-rimmed glasses, tight pants and t-shirts of a "true" metal band that the wearer has never listened to.

3. Mallcore may also refer to a "true" metal band that changed the direction of their music to suit a "mallcore" audience.
MALLCORE KID: I got Unearth's and The Black Dahlia Murder's new CD, and also this rad Judas Priest T-Shirt at Hot Topic ... I am SO metal it hurts.

METALHEAD: Y'mean, "so mallcore it hurts"?

MALLCORE KID: Hey I'm not mallcore, I have a Judas Priest t-shirt! They R metal!

METALHEAD: Uh-huh, OK. So what's your favorite Judas Priest song?

MALLCORE KID: I dunno, I'll have to check them out.
by SaturnsSon May 20, 2007
 
7.
Form of loud music (which its fans think to be metal, but its really not) with uninovative guitar riffs, electronic sampling, random screaming and "I-will-slit-my-wrists-because-my-life-sucks -boo-fucking-hoo" lyrics.
Slipknot (the most famous)
by Fyodor Sumkin January 13, 2005