Thats a new one on me! - Idioms by The Free Dictionary
that's a new one on me (redirected from thats a new one on me!)
that's a new one on me
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.
a new one on (me, him, etc.) an account, idea, or joke not previously encountered by me, him, etc. informal
a ˌnew one on ˈme a story, joke or piece of information that you have not heard before and which you may find difficult to believe: Butter that always stays soft — that’s a new one on me. ♢ No, I’ve never heard that story before. It’s a new one on me.