slang Short for McDonald's, an international fast food restaurant chain. Can refer to one of their restaurants, the food that they serve, or the company as a whole. I'm heading to the McDuck's across the street after class, do you want a burger or anything? Well, it's no wonder you've been putting on weight—you've been eating McDuck's every day for the last six months! I heard that McDuck's is looking to buy up yet another fast-food chain.
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McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.