I could care less
could care less
Does not care about something at all. The phrase is a colloquial version of "could not care less." Fine, I could care less what you do! Good riddance! You're going out with my ex-boyfriend? Great. I could care less.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
I could care lessverb
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.