Definition of cracked-out:
(adj) :
Broken so that cracks appear on, or under, the surface.
(adj) :
Broken into coarse pieces.
(adj) :
(of a voice) Harsh or dissonant.
(adj) :
(slang) Crazy; crackpot.
(adj) :
(slang) Extremely good at something (usually a video game).
(adj) :
(slang) (usually of a video game) Surprisingly very good in the quality of experience.