Is it, "I COULD care less," or "I COULDN'T care less."?

I always thought it was, "I couldn't care less," as in "I care SOOO little, that there's no way I could care any less." Yet I hear a lot of ppl saying, "I could care less," which in my mind means, you must care 'a little' if you COULD care less. So...which is the... show more I always thought it was, "I couldn't care less," as in "I care SOOO little, that there's no way I could care any less." Yet I hear a lot of ppl saying, "I could care less," which in my mind means, you must care 'a little' if you COULD care less.

So...which is the correct phrase & which do you use...not that I really care :)
Update: @OLD MAN WITH A BEARD ~ LMAOF
Update 2: @Day Trippin' ~ "You're sooo right. When I hear ppl say that, it makes me wanna smack 'em upside the head, if I "could of" :)
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