تعريف ومعنى "bee in {one's} bonnet"

What is the origin of the idiom "bee in one's bonnet" and when to use it?

The idiom "bee in one's bonnet" has its origin in the imagery of a bee buzzing inside a person's bonnet or hat. It figuratively represents an idea or concern that occupies someone's mind persistently and causes them to be preoccupied or obsessed. The phrase often suggests that the person is fixated on a particular topic, issue, or plan, and they cannot stop thinking or talking about it. In other words, this expression is used to highlight the idea of a persistent and sometimes bothersome mental preoccupation.