In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Mud
To dream of mud means that troubles and problems await you over the coming days, which you will easily overcome. If you are dirty with mud then you will hear insults from others.