When a girl pulls her thong up in front of you?

Anonymous
OK so I'm in my house and decide to watch tv, the house is new and the basement where we(the kids, I'm 17) go to watch TV doesn't have furniture yet so we sit on the carpet. My sister and her friend are already there so I sit behind them.

Anyway a few minutes later my sisters friend lifts up her top and pulls up her g-string(you know she pulls it up above her hips, until they're way above her jeans) knowing I'm sitting directly behind her.

Does this mean something or am I just being stupid?
When a girl pulls her thong up in front of you?
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