dude (do?od, dyo?od)n.1. Informal An Easterner or city person who vacations on a ranch in the West.2. Informal A man who is very fancy or sharp in dress and demeanor.3. Slang a. A man; a fellow.b. A person of either sex.tr.v. dud·ed, dud·ing, dudes Slang To dress elaborately or flamboyantly: got all duded up for the show.interj. Slang Used to express approval, satisfaction, or congratulations.[Respelling of late 19th-century American slang dood, fop, dandy, probably from shortening of Yankee Doodle, a bumpkin who sticks a feather in his cap in imitation of fashionable macaronies in the American popular song “Yankee Doodle” : Yankee + doodle, fool; see doodlebug.]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.dude (du?d; dju?d) n1. Western US and Canadian a city dweller, esp one holidaying on a ranch2. chiefly US and Canadian a dandy3. US and Canadian a person: often used to any male in direct address[C19: of unknown origin] ?dudish adj ?dudishly advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014dude (dud, dyud) n. 1. a man excessively concerned with his clothes, grooming, and manners. 2. Slang. a fellow. 3. a person reared in a large city. 4. Western U.S. an urban Easterner who vacations on a ranch. [1875?80] dud?ish, adj. dud?ish?ly, adv. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.dude, dude ranch – A dude is a city-dweller, especially one vacationing on a ranch?hence, dude ranch.See also related terms for ranch.Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.