Then lo and behold, I heard the same term on the radio the next day. Am I always the last to know? I don't get out much.
The word? Gooniebag. It refers to the bladder inside a wine cask. Some of you foreign overseas types may not be familiar with wine casks but Australians of my age know them well enough. Some of us have moved on from casks but I have a good reason for not doing so. While I do at times drink bottled wine, an excess of bottled wine causes me allergy problems. There is something in bottled wine that does not seem to be in cask wine, so at home I drink cask wine. Some of you may know it as a bag in a box wine or just box wine.
You are never going to get good wine in a gooniebag but some of it is quite drinkable. It can be incredibly cheap and can be had for at its cheapest and worst for perhaps $15 for four litres. If you still don't quite get what a gooniebag is, here is a photo from Wikipedia. For better or worse, it is an Australian invention, fifty years ago in the state of South Australia.
In some circles the cask has replaced Bex Powders as the house wife's friend, leading to mothers collecting their children from school and then being pulled over by the police and found to be driving over the alcohol limit. They are also a cheap way for teenagers to get drunk and at their price, very cheap alcohol for our indigenous to buy. The gooniebag might be an Australian invention, but I am not sure that it is too much to our credit.