What does it mean when someone says to you, "You're just talking through your hat"?

Question:My dad's friend used it the other day and I heard it used in one of my favorite movies. Thanks.

Answers:
I tend to believe it means, you are talking without thinking; there is no logic in what you are saying. Your words came out spontaneously, without thinking, not from inside your head. Hence the idiom "through your hat".

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