I think it is Australian slang for a sexual encounter. I've only heard that term used in that context from my Australian best friend.
I see a subtitle from a show. It is "before work on a Monday morning, coming for a root." What does 'coming for a root ' mean? Thanks.
Dragonfly is correct.
We have a marsupial rat in Oz called a bandicoot that eats roots and leaves. One of my friends had a boyfriend who did the same thing. She called him the Bandicoot.