I was dancing , and from the crowd, a set of 2 , one of them looked a few times at me, and than speaking with her friend, many times she did that. But for me it didn't look like she was lookking at me because she liked me, she was just looking around, is it possible? Anyway , a little bit after, she looked at me, and I tryed to maintain eye contact, she was maintaing to (the only problem is that I wasn't sure that she was looking exactly at me it was a little far and dark in the club) and she made the hair thing that they do (was this an invitation?) after the 2-3 second hair thing she looked again, and some people just passed between us and interupted the eye contact, after that she left! Wath happend here?!

Sounds like you got an IOI, but without doing something with it, it quickly turns to boredom and she'll move on to something more interesting. In the future, keep the 3s rule in mind.

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-Breeze

So... I should have gone to her and say wath? "hy wanna' dance? " or wath? Thank you man!

Same shit happened to me a few months ago in a club. It just opened and people weren't even dancing yet. They were just talking. There was this one girl who sat across the room in those comfy white sofas. I couldn't tell if she was looking at me or not(I have eyesight problems.) she even waved over at my direction and discreetly I looked around and saw that she was waving at me. But in the end, I pussied out. I hated myself for that night.

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"If you don't succeed, destroy all evidence that you tried."

Yeah, once you get an IOI like that, go on and open. I'm a big fan of C&F, so I'd open with something like:
You: That'll be $5, please
Her: What?/Why?/etc (response doesn't matter)
You: I normally charge for people to eyeball me. But I think I'll let it go this once. How do know each other? (move on from there)

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-Breeze