It's an antique expression. Very retro of the chick to be using it now.
Well, I'm a fan of antique expressions... wiki is pretty modern, so it's definition is lame:
fresh (comparative fresher, superlative freshest)
5. Being rude.
No one liked his fresh comments.
That's ok, but a little extreme in connotation. I was always regarded "fresh" as "forwardly frisky". So, in DJ terms, it's a good thing to hear because you are pushing your boundaries and she's responding with a very classic "Oh my!" *flutter eyelashes, blushes, fans herself with fan* It's like an old-school ASD saying. You can keep pushing, so long as it's tasteful. Now, when she starts calling you a cad or a masher, then you better back off a bit.
Here are some more appropriate definitions for you:
8. Not fatigued; brisk; vigorous
10. Looking youthful or healthy
14. (informal) forward or presumptuous <-- that's what you are getting