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I often see couples where the girl sometimes speaks to her boyfriend using 俺
as a 'you'.

Where does it come from?  
Can other pronouns like 僕、私、あたし, etc. can be used the same way?
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2012-10-17T04:53:04.340
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2014-08-21T00:09:29.317
2014-08-21T00:09:29.317
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question
second-person-pronouns
俺 and 僕 used as second person singular pronouns
In a word: imitation.

Between couples, often men will refer to themselves as ore. A woman may refer
to him (hence "you") by imitating his pronoun of choice. Often ore is not
appropriate in various social situations, such as work. As such, some men may
refer to themselves as boku. As a result, some people (both male and female),
such as bosses (who may refer to themselves as ore), may refer to him (hence
"you") by imitating the choice of his pronoun.

I cannot recall hearing it with regard to wata(ku)si or atasi. wata(ku)si,
though, is rather unlikely since it could just as equally apply to either
person, so the sense of imitation would be more difficult to catch.
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2012-10-17T05:05:13.577
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2012-10-17T05:05:13.577
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answer
When addressing children, first person pronouns are sometimes used as second
person pronouns. This is done for different reasons, including

  1. teaching them to use personal pronouns instead of referring to themselves by name.
  2. as a convenient pronoun when you don't know the their name.

Using this to address adults seems a bit strange, and I would find it slightly
condescending if my boss used it to address me.

However, between couples or close friends it can be used as a sign of
affection/intimacy. I have heard it with all of "(w)atashi", "ore" and "boku".
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2012-10-17T09:44:11.990
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2012-10-17T09:44:11.990
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answer