duff
n.— «“I like to earn my duff (navy slang for pudding).” Tapsell’s favourite “duff” is trifle and fruit salad, and not an ounce of it seems to have stuck to her.» —“Rules of engagement” by Denise Irvine Waikato Times (New Zealand) Sept. 25, 2004. (source: Double-Tongued Dictionary)