What does it means when a boy calls you "missy"? It is a way of softly flirting?

What do you think... he just randomly call me "missy" and it the first time he call me that way.

Besides he introduce me to one of his friends as an awesome and cool girl.

How can know if we are passing the friends zone?
What does it means when a boy calls you "missy"? It is a way of softly flirting?
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