whole other thing

whole other thing

Something very different to, and often more difficult or complicated than, something else. Often spoken or written more colloquially as "whole 'nother thing." I don't know what you think you know from working in television, but working on a film is a whole other thing! It's one thing to babysit your friends' kids from time to time, but having your own children is a whole 'nother thing.
See also: other, thing, whole

whole nother thing

Rur. a completely different matter. (Often "corrected" to a whole other thing. The word nother is a shortening of another.) Borrowing! That's a whole nother thing! I thought you said stealing!
See also: nother, thing, whole