The “AB” is an Adelaide urban legend. The name is an abbreviation for ‘Absolutely Beautiful’ or ‘Atomic Bomb’ (and other less polite variants). In legend some drunk university students were in a Greek ‘yiros’ takeaway late one night, and could not choose between yiros or chips. They ended up with chips topped with yiros meat (lamb), covered with garlic (and usually tomato) sauce. Still widely used as a hangover cure!