Girls, I like to know what does it mean when you call a guy "pretty boy"?

Hi, I really want to know what does it mean a girl calls me pretty boy? I really want to ask her but every time I want to ask, I get shy about it but really, I want to know if you really mean it, thanks!

Would it be considered flirting?
Girls, I like to know what does it mean when you call a guy "pretty boy"?
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