in. & tv. [for one person] to drink something, usually beer, quickly and in large volumes. : He chugged three in a row, and they came right back up again.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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chug definition
jargon To run slowly; to grind or grovel. "The disk is chugging like crazy." [Jargon File] (1995-03-25)