late 14c., lousi, "infested with lice," from louse + -y (2). Figurative use as a generic term of abuse dates from late 14c.; sense of "swarming with" (money, etc.) is Amer.Eng. slang from 1843.
mod. rotten; poor; bad. : This mushy stuff is lousy. Do I have to eat it?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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