This is a very common expression in French. Literally, it can be translated by “Imagine”! However, the meaning is closer to “Guess what” or “Believe it or not” and we use it to express surprise or mild disbelief. We say Figure-toi! to friends and family members. Figurez-vous! is more formal. Ils se sont mariés, figure-toi! They got married, believe it or not!
Figure-toi! Figurez-vous!
French with Valerie 