From card no. 3YZDVEB7:

to say "I could care less" implies that you DO care a certain (undefined) amount, and it is possible for you to v c care even less.
to say "I could care less" implies that you DO care a certain (undefined) amount, and it is possible for you to v c care even less. Whatever, its lan wordplay and get over it. You sad sad whoever you are!