What does it mean when a woman let you touch her butt?

I have been knowing this woman for about two (2) weeks now, and one day she ask me to walk with her to the convenience store to get something to drink. As we were walking, she was walking in front of me, so I said what the heck and just started to grab her butt and rub it. She didn't say anything as we were walking, and she continue to let me rub her butt. She didn't tell me to stop. What does that mean and what kind of signal is she trying to send me? Please help because I really like this woman!

What does it mean when a woman let you touch her butt?
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