Talk through your hat British informal verb phrase
To talk about ridiculous, incorrect or irrelevant things you don't understand
If you often talk through your hat, no one wants to talk with you anymore.
Don't pay attention to him. He sometimes talks through his hat.
To overstate one's accomplishments or knowledge; to boast
Tom likes to talk through his hat, but no one cares.
You shouldn't ask Luci how she has been because she will constantly talk though her hat.
This started life within the USA, within the late 19th century, with a marginally diverse meaning from the show one. It was at that point implied to rave and shy.
This phrase is used to describe something very modern or updated or something that no longer looks like what it's used to.
It has been a long time since I left my high school, and now I have to admit that it's certainly not your father's high school anymore.