What Does #OOTN Mean The #OOTN Meaning on Social Mediaootn heart importance is a term used to describe an outfit that is worn during the night or for special occasions. symbolizes love, emotion, and romance. Therefore, an ootn showcases an fashionable and captivating outfit that reflects one's love for fashion and enjoys the nighttime vibe. Wearing an ootn can boost one's confidence, make an impression, and exude sophistication and charm. Regardless of it's a glamorous dress or an chic suit, the ootn will ensure that you stand out and leave a lasting impression at any evening event.