What does it mean when you dream about something and it comes true. My dreams arent like deja Vu. ill dream of some random event. I wont remember it but when it happens i do. Can someone answer?

What you are describing is deja vu, precisely because you say "I won't remember it but when it happens I do." That is not a description of a prophetic dream but a description of deja vu. A dream that "comes true" is a dream that you remember when you wake up from the dream. You would be able to describe that dream to another person and/or record it on tape or in a written journal. Then some time later the event seen in the dream actually would occur. The phenomenon you describe, in which you only seem to remember the dream AFTER the event occurs, is the trick of the mind called deja vu.