student asking question

It seems like native uses "who are you?" when they are angry. Is it a slang or something?

teacher

Native speaker’s answer

Rebecca

Actually "who are you" here is part of the joke. The voice of the machine was consistently a woman and then suddenly it was a male voice. So she is asking "who are you" because the male voice is like a new person she is meeting that she doesn't know. It isn't slang and means the same as "who are you" in any other situation.

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