That's news to me
You're speaking to someone and they casually talk about something that happened or is going to happen that you had no previous knowledge of beforehand as if you did. They basically assume that you are aware of this.
For instance, if a girl says says to a guy, "we're going cinema this weekend", and he was previously unaware of this then he could say "that's news to me..".
That's news to me by Haricots August 1, 2013
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