Twp Doolally
"How do you say dose in welsh?"
"What you mean like a dose of the clap?", I said
"No", said my mate, "he means stupid - thats what they say in Ireland."
My friend decided the best translation was "Twp doolally". Not one that I'd heard and doolally doesn't sound welsh at all.
The irishman loved it and spend the next hour in the pub saying twp doolally.
He told me with pride that he had learned to say "dose" in a large number of languages including polish and chinese.
I'm not sure whether or not he was lying.