What does sassiness mean or represent in girls?

I'm just curious what everyone else has to say. To me when I meet a girl that is unnecessarily sassy, I think it seems to show that she's the female equivalent of when a male pushes others to get what he wants.

So basically, are sassy females that way for selfish reasons, to get their way more often because they can get away with it? I hardly believe that anyone is JUST like that for no other reasons.
What does sassiness mean or represent in girls?
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