The nickname fans utilize for Ayumi Hamasaki, a Japanese singer. 1. A type of tiny seafood.2. A nickname Ayumi Hamasaki provided by herself. She often make use of "Ayu" instead of "I". ass, booty, anal area, junk (1) A small asian girl who goes to college out of town and dates your very best friend. Ayu's also drive eclipses.(2) an intimate work on a large balcony facing the street, also referred to as the "philly fake-out"