Girls, What does it mean when a group of women looks at a man and talk among themselves?

Anonymous

For context. I spent last Saturday on a 20 km hike. As I reached my destination, a seaside resort, I walked past a number of restaurants. A group of women, mid-twenties to early thirties, was sitting near the window in one of the restaurants. I noticed them while they were staring at me and then they glanced at each other and started talking among themselves. They were kind of giggling or laughing, but not quite. When I looked back a few seconds later, I saw them staring again. I am not that great at interpreting body language, so I was wondering: could you shed some light on this? I am curious: what could have gone through their minds?

Girls, What does it mean when a group of women looks at a man and talk among themselves?
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