no duff
other.— «L/Cpl Steven Jones, 25—an Army passenger on the plane—yelled, “No duff, no duff, we are on fire, we are on fire,” before communication was lost. “No duff” is a military term used to indicate a real emergency instead of a drill.» —“http://www.thesun.co.uk/sol/homepage/news/campaigns/our_boys/article988834.ece” by John Coles Sun (United Kingdom) Apr. 2, 2008. (source: Double-Tongued Dictionary)
Further reading
Ever wonder what medieval England looked and sounded like? In Old English, the word hord meant “treasure” and your wordhord was the treasure of words locked up inside you. A delightful new book uses the language of that period to create...
It was a dark and stormy night. So begins the long and increasingly convoluted prose of Edwards Bulwer-Lytton’s best-known novel. Today the annual Bulwer-Lytton Contest asks contestants for fanciful first sentences that are similarly...
We had a similar expression when I was a teenager in Montreal in the early 1970s. “No guff” meant “I’m not kidding you” or “I’m telling you the truth”.