Crabcore is a contemporary offshoot from the emocore/screamo sub-genre of hard rock music. Unlike almost all other genres and sub-genres of music, crabcore is defined not by aural motifs, tones, lyrical content, or specific instrument ensembles; but rather by physical gesticulations and contortions of the arms and legs of individual band members during live performances of their music.

Crabcore moves
Chiefly among the crabcore musician's repertoire of stylistic gestures is the crabwalk itself, from which the genre's title is derived. The crabwalk is identified by the player's extremely low stance, wherein both feet are set apart from one another as far as possible, while still allowing the player to maintain at least a 90 degree bend in his knees. While in the crab stance, the player then purposefully transfers the weight of his upper body between each leg, achieving a swaying motion intended to have a hypnotic effect among audience members.
Other moves available to crabcore players include;

The 'Richardson Richardson'.
'Krinking'
The 'Beaver Bounce'
The 'Dirty Hamper'
The 'Pestal Press'

Another, somewhat controversial move has gained a foothold in crabcore circles recently, which sees the player simply standing in one spot and running in place. No one understands this move. No one.

The most instantly recognizable signifier of a band within the crabcore oeuvre is the presence of an Arch Cancerped (literally translated; 'chief crabwalker'). The Arch Cancerped (or ACP) is an individual member of the band whose duty it is to set the speed, intensity, and depth of the crabwalk in a given piece of music. Much like the conductor of a symphony orchestra. Typically the ACP wears a black t-shirt and has a dyed-black sideways haircut.