What Does #OOTN Mean The #OOTN Meaning on Social Medianighttime outfit importance is a term used to depict an attire that is put on during the evening or for special occasions. Heart represents love, emotion, and affection. Therefore, an ootn showcases a stylish and alluring outfit that reflects the love for fashion and embraces the evening vibe. Wearing an ootn can boost your confidence, make a statement, and display elegance and charm. Regardless of it's a glamorous dress or an chic suit, the ootn ensures that you stand out and make a memorable impact at any evening event.