One of those
miraculous phrases that makes the
English language great. Depending on how it is said, can signify either genuine suprise or annoyance with the obvious.
First case: often said slowly, emphasizing each word and with "shit" often raised slightly. = "
You don't say"
Second case: usually said quickly and without as much emphasis, for you really just want to get on with your life and not listen to this fucktard anymore