What Does #OOTN Mean The #OOTN Meaning on Social Mediaootn heart importance is a phrase used to describe an outfit that is put on during the evening or for special occasions. Heart symbolizes love, passion, and romance. Therefore, an ootn showcases an stylish and captivating outfit that mirrors the affection for fashion and enjoys the nighttime vibe. Wearing an ootn can enhance one's confidence, make an impression, and display sophistication and charm. Whether it's a glamorous dress or a chic suit, the ootn will ensure that you stand out and leave a lasting impression at any evening event.