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)
Further reading
Joe from Fort Lauderdale, Florida, asks about pony, the term he and his fellow maritime academy students used to mean “a practice test” or “a copy of a previous test” to help them crib for an exam. Among 19th-century British students, the slang term...
You know the expression fly in the ointment: It’s that glaring typo on an impressive resume or that first scratch on a brand-new car—the one little flaw that spoils it all. This phrase goes all the way back to the biblical Book of Ecclesiastes! And...