WHAT DO YOU CALL IT?

An answer to a question I really need to know
If you need to spend a penny where do you go
Everyone would say toilet that's certainly true 
However some people like to call it the loo

Some of us are lazy when going for a pee
They would mention going to the W.C
The Americans call it John I do believe 
Comes in handy when you need to relieve

The expression I find most amusing and funny
Is that the Aussies call the lavatory a dunny 
Unfortunately the word khazi isn't used anymore 
So many words for toilet that's for sure