Urban Dictionary OOTNootn heart symbolism is a phrase used to describe an attire that is put on in the night or for special occasions. represents love, emotion, and romance. Therefore, an ootn showcases an trendy and captivating attire that mirrors one's love for fashion and embraces the evening vibe. Wearing an ootn can enhance one's confidence, make a statement, and exude sophistication and charisma. Whether it's a glamorous dress or an chic suit, the ootn ensures that you stand out and leave a lasting impression at any night event.