Definitions by BlooLynx

Arm-mouth 

Used to define the hell bent spawn Ichigo (bleach protagonist) sprouts from his arm/shoulder when it is cut off or damaged when he is not in control of his inner hollow.
In episode 124, and 233.

Zangetsu attacks Ichigo when his Zanpakto is released from his soul, who usually keeps the hollow from taking over, Ichigo looses control, Zangestu injures Ichigo's arm, and Ichigo's Arm-mouth attempts to devour Zangetsu.

Arm-mouth by BlooLynx October 25, 2009