What does it mean if a guy calls you 'girl'?

So, there's this guy at work who is higher up than me. He is nice to everyone but every time he compliments me he'll add girl to the end of it. Like normally he'll compliment me on my work and say girl after. Is this a normal guy thing? (I don't kind it, just curious)
What does it mean if a guy calls you 'girl'?
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