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2.
A genre of metal music in which the preforming artists, during the break-down section of their song, lower themselves into a crab like position while continuing to play their instruments.
Some scientists speculate that this movement is intended to emphasize the rhythm and beat of the break-down section in a song.
Person 1: dude that band is so sick, but why do they squat like crabs during their songs

Person 2: Its because they're Crab Core duh!
by YogurtYumYums July 07, 2009
 
1.
a genre of hardcore music pioneered by the Columbus, Ohio band Attack Attack! It entails being terrible at life, the universe, and everything, and crabwalking as a dance form.
Dude, that new Attack Attack! video is so crabcore.
by crabwalkerenthusiast June 15, 2009
 
3.
A type of genre of screamo hardcore music by the band Attack Attack! The genre isn't of musical value but of appearance as the bands do crab like movements on performances. These include bending your knees down until your crotch practically hits the floor and doing jumps in this position.
Guy 1: "Dude have you seen that new Attack Attack! band?!"
Guy 2: "Oh yeah man, they're so crabcore!"
by BoomBox1139 June 25, 2009
 
4.
A joke term invented by a couple of music blogs to describe the modern emo metal played by the band Attack Attack!, based on the crablike crouch stance often performed by the guitarists / bassist.
It's not a real genre of music, since the term was coined to describe one band which plays a certain style of a much more well defined genre of music. Pretty sure that every band on the planet that has ever had success plays a personal style of some sort of larger, more well defined movement. Attack Attack! is a contemporary emo band, regardless of what they do with their legs. Calling a band crabcore is like calling Owl City a postalservicecore band.
by some old bitter fogey asshole January 05, 2010