Do we really think, as a community, that copy (in its various forms) isn't part of UX? Dumping this person over to English.SE isn't going to help. The person is looking for a reason as to why it's become an accepted norm to state, "Oops!" on error screens. That's user experience!!!
We're getting a bit hung up here on "copy is included in UX" and ignoring the actual situation here I think.
The question, as originally asked, was certainly not a matter of copy:
why we using the word OOPS if something went to wrong in the sentence or communication with others? I would like to know the correct information regarding this question. Any help would be much appreciated.
It was a question asking about the usage of english in general with no apparent tie to UX or use in a user-facing manner. The accepted answer drives this point home, it is entirely factoids about the origin of the phrase and absolutely meaningless in terms of UX.
This is not a question about writing copy:
What is the origin of the phrase "raise the roof"?
This is a question about writing copy:
Is it appropriate to use the phrase "raise the roof" in a marketing site for an enterprise app?
Now the question is reopened for some reason, and we're in a bit of a nasty state; the question is asking for UX answers and currently has a +6 accepted answer that is explicitly an English lesson and no more relevant to UX than "don't set users on fire" is relevant to UX.
Personally I think the question should be reverted to it's original state, migrated to English (if they want it, seems in-line to me) and, if anyone cares to know the answer, the edited version should be asked as a separate question, where it can remain on UX. I don't really feel comfortable with the edited question and deleting the now non-answer that was originally accepted, because the question has clearly changed entirely in it's intent.
To continue the discussion, the real question is: At what point are questions related to English not about user experience?
Content helps to shape the experience for users (people) but many of us are not copywriters.
We can limit questions regarding content to ones related to content quality and grouping, instead of specific semantics and taxonomy.
But if someone asks "What's a better way of saying [x]?", do we also not need to think about how this impacts users?
I found this quote "The words are often the most valuable experience."