no duff exclamation 1noun 1 exclamation1 •(UK, slang) Indicating that this is not a drill or training exercise. noun1 •(UK, slang) An incident that is not a drill or training exercise; an emergency. Also end of exercise. Stop drill immediately. As a ‘tap out’ called by during physical training. Sim munitions training in Australian Swat ‘end ex’.“Get him in here, and radio a ‘no duff’ [casualty] to HQ.” — 1999
