sent. I don't care!; I don't care to the maximum amount, and it is, therefore, impossible to care any less. (The affirmative version does not make sense, but is widely used, nonetheless.) : So you're late. I couldn't care less.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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