wallabyEnglishOxford Dictionary of Englishwallaby /ˈwɒləbi / ▸ noun (plural wallabies) an Australasian marsupial that is similar to, but smaller than, a kangaroo. Family Macropodidae: several genera and numerous species. ▪ (the Wallabies) informal the Australian international rugby union team. – PHRASES on the wallaby (also on the wallaby track) Australian and New Zealand English informal, dated (of a person) unemployed and having no fixed address: during the Depression thousands of Australians went on the wallaby.– ORIGIN early 19th century: from Dharuk walabi or waliba.