naff 1 (n?f)adj. Chiefly British Slang Unstylish, clichéd, or outmoded.[Possibly of dialectal origin.]naff?ness n.naff 2 (n?f)intr.v. naffed, naff·ing, naffs Chiefly British Slang To fool around or go about: “naffing about in a tutu” (Suzanne Lowry).Phrasal Verb: naff off Used in the imperative as a signal of angry dismissal.[Origin unknown.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.naff (næf) adjslang Brit inferior; in poor taste[C19: perhaps back slang for fan, short for fanny] ?naffness nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014