I've used the expression "to be something else" in a lot of different contexts. I'm wondering now whether sometimes I have used it wrongly. This is when I have said it to refer to someone as a mess or a disaster. e.g.:
A: "He lost his phone again".
B: "Really? I can't believe it. He's something else".
Is the use of this expression correct to say such things? Can this phrase be used negatively?