talk through one's hat suomeksi - Sanakirja.org (englanti-suomi)

Käännös		Konteksti
Verbit
1.	puhua läpiä päähänsä	idiomaattinen
2.	puhua vastoin parempaa tietoaan	idiomaattinen

(idiomatic) To speak lacking expertise, authority, or knowledge; to invent or fabricate facts.
(idiomatic) To assert something as true or valid; to bluff.

"Mr. Pride said to me a moment ago that they spoke better English in Boston than any other place in the world."
"Did he, though, Lady Lawless? That's good. Well, I guess he was only talking through his hat."
He's conceited and opinionative and argues all the time, even when he knows perfectly well that he's talking through his hat.