What does "Are You Cracked?" mean?

Yes, it refers to someone being crazy…It’s another way of saying Are you on crack?

It’s sort of like, ‘are you cracked out?’

The expression was used long before there was any association with “crack.” It implies that you are damaged the way a cracked plate or glass is. By extension, it came to mean “are you nuts?”

@gailcalled is correct, as evidenced by the Mad Magazine rip-off Cracked

I have always thought it means are you mad, nuts, crazy.

It means “crazy” as if your head has been cracked open (brain injured).