The word "loo" is a British term for a toilet that is polite and informal. It is commonly used in the UK and Ireland.
They say "dunny" in Australia and New Zealand because in Scotland in the 1800s, they called it a dunnekin, which was a Scots word that literally means "shit house."
What is this referencing?
According to the local LLM:
They say "dunny" in Australia and New Zealand because in Scotland in the 1800s, they called it a dunnekin, which was a Scots word that literally means "shit house."