"Oh, hey there!..." you reply with half an uncomfortable smile. Something about the way this woman made a show of her more "personal" regions was a rather serious turn off. After all, what kind of a person would do that to a stranger in public? By all rights she's flashing you! Oh dear... perhaps you could collect a hefty cash sum on charges of sexual abuse! But either way, that's not going to help you out of this situation. You have second thoughts about associating with this kind of a person. "So, what are my options..." you think to yourself, looking around the room awkwardly for some kind of a way out.
Do you...
1) Make up an excuse, like "Oh! Shit! I forgot, I have a dentist appointment now >.>;; "
or!
2) Sit down at a table with a bunch of strangers and say "OH! These are my friends I was waiting for. I'm gonna go join them. Seeya later!"