What does “out of your head” mean?

to stop thinking about someone or something, or to dismiss an idea from your mind

How is “out of your head” used?

In M*A*S*H (1970), one line is: “He has flipped his wig, that he's out of his head, that he's a lousy surgeon.”

The clip at the top of this page is from M*A*S*H (1970).

He has flipped his wig, that he's out of his head, that he's a lousy surgeon.

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