Unit: Flat, apartment
Up yourself: Have a high opinion of oneself
Up somebody, get: To rebuke somebody. As in: "The boss got up me for being late."
Ute: Utility vehicle
Vegemite: Black, yeast-based spread, typically eaten with bread or crackers
Walkabout, its gone: It's lost, can't be found
Woop Woop: Invented name for any small unimportant town; a long way from civilization. As in: "He lives in Woop Woop."
Wowser: Straight-laced person; prude
Yabber: Talk (a lot)
Yakka: Worker; as in "a hard yakka."
Yank: An American
Yewy: U-turn in traffic
Yobbo: An uncouth person
Zack: Sixpence (5 cents). As in: "It isn't worth a zack."