I've known that "Oh boy" is similar to "Oh my goodness", but can I use it when speaking to a girl?
Also, what are the popular alternatives?
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Daria - (rolls eyes) Oh, brother.
Jake - He calls himself brother? You mean like Brother Ted?
Daria - No, like, "Oh, brother, you're all crazy."
So there's absolutely no reason you couldn't say "oh, boy" when talking to a girl.
You can, the "boy" in the phrase is not addressed to the person you are speaking to. (It probably started as a minced oath with "boy" replacing the blasphemous "Jesus" or "God")
There is a well known song by Buddy Holly with lyrics "Oh boy, when you're with me...".
As slang it is a little dated. Buddy Holly's song was from the 1950s
Can I say “Oh boy” to a girl?
The best way to understand this issue for an English learner.
When you utter phrases such as ...
... you are not addressing anyone. That speech fragment is not directed to the person you are talking to.
They are exclamations.
Incidentally: do note that the comments that "Oh Boy" is "dated" are whacky; ignore.