Whole ‘nother book
Another way to say “a whole ‘nother story,” or when a new topic is on a different level or problem
Person 1: Yeah, she’s crazy.
Person 2: But what about that other girl?
Person 1: That’s a whole ‘nother book, man.
Person 2: But what about that other girl?
Person 1: That’s a whole ‘nother book, man.