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.
Go to bed
I feel so sleepy, so I want to hit the hay.