The correct form is 'I couldn't care less'. The idea is 'I care so little that it would be impossible for me to care any less'. 'I could care less' is typically said by people who don't really think about what they are saying.
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Clive'I could care less' is typically said by people who don't really think about what they are saying. It is a mistake that really irritates many thoughtful people.I couldn't agree more.