I am curious how a Tucker equates to food ?
Not sure Bruce, just a word that I've grown up with so it sounds natural to me.
Google says -
"This is some great Aussie slang for food that has been in constant use since the 1850s. The original meaning is of a meal, that is, something to be tucked away (in the stomach)".
Whether they nailed it....not sure, could be a furphy.