DUFF Meaning of DUFF in English v.tr. sl. 1 Brit. Golf mishit (a shot, a ball); bungle. 2 Austral. steal and alter brands on (cattle). duff up sl. beat; thrash. [ perh. back-form. f. DUFFER ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012