1 definition by BoomBox1139
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!"
Guy 2: "Oh yeah man, they're so crabcore!"
by BoomBox1139 June 25, 2009