What does 'Talk out of your hat' mean?

If someone is talking out of their hat, they're talking utter rubbish, especially if compounded with total ignorance of the subject on which they are pontificating. ('Talk through your hat' is also used.)

Idioms similar to 'Talk out of your hat'

All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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