Definitions by Fyodor Sumkin

mallcore 

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)

mallcore by Fyodor Sumkin January 13, 2005