n. strong or inferior liquor, especially whiskey. (Folksy.) : The old man nearly went blind drinking all that rotgut.
mod. [of liquor] strong or fiery. : You've got to stop drinking that rotgut liquor and think of your health.
n. weak or otherwise inferior beer. : She can afford something better, but she drinks nothing but cheap rotgut.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[rot-guht] 
