Meaning of "talking through her hat"

[Emma]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #1 "Up to his ears", question 7

He accused her of talking through her hat and refused to accept a word of what she said.

(a) talking sense
(b) talking straight
(c) talking nonsense
(d) talking tough

English Idioms and Expressions, Intermediate level

ESL/EFL Test #1 "Up to his ears", answer 7

He accused her of talking nonsense and refused to accept a word of what she said.

Correct answer: (c) talking nonsense
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What is "talking through her hat" means?

Emma

[Alan]

Hi,

Talk through your hat is an idiom indicating that you have no knowledge or understanding of what you are talking about. This is allegedly of American origin and had originally the sense of bluster suggesting that you're talking a lot but none of it makes sense.

Alan
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English as a Second Language
You can read my ESL story Relative Pronoun