"She looks **amazing**."
"I know. I love how **everything** she's wearing goes **perfectly** together."
(Someone talks about something nobody cares about.)
"**I could care less.**"
"Don't you mean, 'I couldn't care less.' ?"
"Sure. Hey, you know what? Your outfit is **fantastic**."
According to a few people, a sarcastic way to say you really couldn't care less.
Probably what was originally intended is a phrase like "I could give a shit," just a little more subtle than "I don't give a shit." Or "I could give a damn." So they could care less, but they still don't care.
Sam: I could care less about that, just as long as we don't miss Glee!
Stupid people often complain about this phrase, insisting that "I couldn't care less" should be used instead. This is because they fail to realize that "I could care less" is an appropriate and historically popular idiom that dates back to the 1960s.
The very same morons will probably tell you, "But if you could care less, that means you actually cared about it at least a little bit in the first place." That is because the sarcasm is lost on them. Should you hear this, just smile and enjoy knowing that you are speaking to someone of low intelligence.
Reggie: "I could care less, man."
Pete: "Haha, you mean 'I couldn't care less.'"
Reggie: "No I don't. You're retarded."