I have never heard the term outside South Australia, but it was common for decades to answer a child asking an awkward question about something to say, "Oh, it's just a wigwam for a goose's bridle". Curiously, this always seemed to satisfy the child but, covering so many things, it must have caused confusion in many tiny minds.
A childhood belief about speaking

others believed things like this
- When I was a child I used to believe that the things in my room became smaller but it was me who was growingAnon
- Anytime you had a question (any question at all) you just called the president.— Erin
- I used to believe that if you slept with the covers covering your neck, vampires couldn't bite you. — Moot
- i used to believe peeps with curly hair had a 3rd ear wich they can read peep's mindsAnon
- WHen I was a kid i used to believe you could dig to Australia— Chie
- When I was a child, I used to believe I would never get old.— Luiz Guilherme - Yazigi