ChrisE, Malone . .
"Ute" has virtually replaced "tilly" (utility truck)
When "stubbies" took their place beside "tinnies" in the '60's' they were known as "stumpies" where I lived, but the easier to pronounce name soon prevailed
Arvo = arvie = arv
Some abbreviations from the racetrack: Quaddie (Quadrella), Tri (Trifecta), Quinnie (Quinella)
Other abbreviations (and examples may not be as common as I had thought): "Nasho" (National Service), "Myxo" (Myxomatosis . . a disease introduced to control the rabbit plague), "Wal" (policeman . . from 'walloper' = rhyming slang for 'copper') . . Possibly used in 'The Old Country' (thanks Grandma) as well