Why would a girl call me “sunshine boy”?

I always see this beautiful woman at the park, she plays volleyball there with her friend. So today, they were there playing, her friend threw the ball and it landed on my side of the field. Then the woman I’m tellin you, she came looking for the ball and at that moment I was going to give it back. She was like “Hi Sunshine boy”, she had a smirk in her face, it caught me off guard. I said hi and gave her back the ball. Anyway, we bumped into each other when we were leaving and she was like “ take care sunshine boy” with a smile, I just smiled back and said bye. I don’t know her, we’ve only had strong eye contact before but we have never talked. I mean does she think I’m a boy? Why would she call me that? Is it a bad thing or a good thing?
Why would a girl call me “sunshine boy”?
Why would a girl call me “sunshine boy”?
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