AHA! That partly explains the lyric,
"Oh, where's that jolly jump-buck You've got in your TUCKer bag... You'll come a-waltzing Matilda with me"
Been wondering about it since I was a child. A tucker bag is like a lunchbox!!
But why would anybody have a "jolly jump-buck" in it (and what is that in the first place?

)?
While we're on the subject, just what is meant by the command/prediction, "you'll come a-waltzing Matilda with me"?
Expiring minds need to know.