n. a talkative person; a braggart. : Quiet, you windbag!
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
windbag
1470, "bellows for an organ," from wind (n.) + bag. Fig. sense of "person who talks too much" is attested from 1827.