What Does #OOTN Mean The #OOTN Meaning on Social Mediaootn heart importance is a phrase used to describe an ensemble that is worn during the evening or for special occasions. Heart represents love, emotion, and affection. Therefore, an ootn showcases a fashionable and alluring attire that reflects the love for fashion and embraces the nighttime vibe. Sporting an ootn can boost your confidence, make an impression, and display elegance and charm. No matter it's an glamorous dress or a chic suit, the ootn guarantees that you stand out and make a memorable impact at any evening event.