Beyonce -- Raps About Elevator Fight ... Insight into marriage

Get ready to interpret ... because Beyonce now obtusely reveals what went down in that elevator ... and one interpretation goes directly to her marriage.

Beyonce dropped a remix for her song "Flawless" with Nicki Minaj Saturday night ... and early in the track says, "We escalate, up in this bitch like elevators ... of course sometime s**t goes down when it's a billion dollars on the elevator."

So how's this for a theory. Multiple reports estimate Beyonce and Jay Z's worth between $900 million and 1 billion. So when she says "of course sometimes s**t goes down when it's a billion dollars on the elevator" ... could that mean there's a billion dollars on the line and they were arguing over something related to the heart of the marriage?

Just a theory.