It means you both have the same input of information, same problems, watch the same tv, etc, so there is a very good chance you will answer the same question the same, or come up with simple answers to simple questions the same.
Now if you would say something that is not of any past experience or interest to your partner,and they say, I was going to say that, then you are special, but as long as you are close, expect it all of the time.

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