Oh, #@%*!

The Pope is working blue:

With millions of people hanging on your every word, it was a slip-up Pope Francis would really have preferred not to make.

While giving his weekly blessing from the Vatican, the Argentinian mistakenly uttered the word 'f***' in Italian before quickly correcting himself.

But within seconds his mistake was posted on dozens of Italian media websites and YouTube and had gained millions of worldwide hits as it went viral.

The words the Pope stumbled on were 'caso' (example) and 'cazzo' which means 'f***' in Italian and often trips up those not used to speaking the language.

Later on, he was warned in no uncertain terms not to use the name "Chuck" in the "Name Game" song:

One can never be too careful....