n. complaints; criticism; negative feedback. (Originally referred to antiaircraft guns and the explosions and damage they caused. The first form is an initialism from German Fliegerabwehrkanonen = flyer defense cannons. I.e., the initial fl plus the first a plus the k.) : Why do I have to get all the flak for what you did?
n. publicity; hype. : Who is going to believe this flack about being first-rate?
n. a public relations agent or officer. : The flak made an announcement and then disappeared.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
flak
1938, from Ger. Flak, acronym for Fliegerabwehrkanone "airplane defense cannon." Sense of "anti-aircraft fire" is 1940; metaphoric sense of "criticism" is c.1963 in Amer.Eng.