Something I was not aware or informed of or knew nothing about until just now. A: "Yeah, Jeff and Anthony have been going out for a few months now." B: "That's a new one—I thought they were just friends." Having to pay for the water you use in your house is a new one to me—is that an American thing or something?

That is something I was not aware about or did not know. A: "Yeah, Jeff and Anthony have been going out for a few months now." B: "That's a new one on me. I thought they were just friends." You aren't allowed to dump your grass clippings here? Well, that's a new one on me.