What does the idiom everything that opens and shuts mean?

The idiom "everything that opens and shuts" is not a common idiom in the English language. It's possible it's a regional expression or a misremembered phrase.

It's likely the speaker is trying to convey something like:

* Everything in general: "I'm going to tell you everything that opens and shuts about this situation." (meaning they will reveal all the details)

* Everything that is important: "I've got everything that opens and shuts in my briefcase." (meaning they have all the necessary documents)

* Everything that is relevant: "We discussed everything that opens and shuts before making the decision." (meaning they considered all the key aspects)

Without more context, it's hard to say for sure what the speaker intended to convey. If you can provide more information about the situation where you heard the phrase, I might be able to give you a more precise answer.