Between you, me and the gatepost British spoken informal
The word "gatepost" could be replaced by the word "bedpost".
Used for saying that what you are going to say is confidential and should not be told to anyone else
I want you to keep this information between you, me, and the gatepost! Could you do that?
Well, between you, me and the gatepost, I cheated on the final exam and the teacher knew nothing about it.
The room you are currently in.
To be secretly working together
Kept in secret
When two individuals desire to be alone with each other, a third person is not welcome.
This expression dated from the 18th century and appeared in the book Eugene Aram, in which a character tells a secret by saying:
“Between you and me and the bed-post – young master’s quarreled with old master.”
people often do irrational or foolish things when they are in love.
I and my boyfriend have decided to get married in the summer. I don't think that's wise, since we won't have enough money saved by then to set up house. But then, one cannot love and be wise.