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.