If you were urinating in a dream, then it could indicate the actual need to urinate in your waking life. Perhaps you are sleeping very deeply, therefore the physical needs are forwarded in your dreams. On the other hand, the dream about urinating could represent the state of your mind, where you are getting rid of unnecessarily. If you saw yourself urinating in front of other people, then it suggest you to make some privacy in your life. If you see the urine of the other person, then it denotes to the things you refused to take in of that certain person.
Read more about dreaming of Urination in other dream meanings interpretations.