it's not a metaphor, it's a plain statement

( VampireMonkeyOnSpeed a super sexy sexual sex terrorist sex, Fri 9 Apr 2010, 17:45, 1 reply)

Of course it's a metaphor
It's a metaphor for "I don't care/I'm not interested". I have no interest in cricket scores, so I'd say "I couldn't care less about cricket scores". I most likely could care less about something else, but as it's a metphor it doesn't matter.

When someone dies, you can say "they kicked the bucket". Except in the vanishingly small percentage of deaths that resulted from someone actually kicking a bucket, then 'kicking the bucket' is a metaphor.
( sandettie light vessel automatic New Twitter - @bollocksreally, Fri 9 Apr 2010, 18:11, closed)

What the hell? 'I couldn't care less' is not a metaphor.
What does the fact that you could care less about something else have to do with it?
( Bob Todd whee, Fri 9 Apr 2010, 18:20, closed)

no it's not, it's a statement in plain language
if you said "I couldn't rub a duck about cricket scores" but actually meant "I don't give a fuck about cricket scores" that would be a metaphor
but saying "I couldn't care less about cricket scores" means you couldn't care less about cricket scores, it's not a metaphor
( VampireMonkeyOnSpeed a super sexy sexual sex terrorist sex, Fri 9 Apr 2010, 19:20, closed)