In chat, "rn" is an abbreviation for "right now". It is a quick and convenient way to express immediacy and is often used in text messaging, direct messaging, or emailing. It can be used in many ways, including if you are asking a question or telling someone what youre doing. For example, "What are you doing rn?" or "Just watching some Netflix". It is important to note that "rn" should not be confused with the professional acronym "RN," which stands for "registered nurse".