This is a Dingbat (or rebus) – put simply, it's a riddle. A phrase that is represented by words and/or pictures. The answer to the following is "just between me and you".

How logical is your mind?
The word "just" is quite clearly between the words "you" and "me". Hence..."just between you and me". To solve them you pretty much say what you see.
Got the hang of it? Good. Because here are 13 more. Best of luck...