Wiktionary
green slip
n. 1 (context Australia South Australia obsolete English) A portion of crown land remaining unalienated due to a size discrepancy between the land survey and the actual division.“''''''”, entry in '''1989''', Joan Hughes, ''Australian Words and Their Origins'', page 241. 2 (context Australia New South Wales English) A certificate of third party personal liability insurance, required in order to register a motor vehicle.