What does it mean when a girl presses her ass against your D while walking by?

I was at work and I was in a closed in area and had a lot of things to stock so I was pushe'd into a small area and one of my Co workers whose a girl needed to get by, so I was looking for a way to get out of her but instead she just went through me like I wasn't there and had her ass all against my private area while walking by me, we talk sometimes and sometimes she giggles at what I say but that's pretty much it, is this something girs do just to do it?
What does it mean when a girl presses her ass against your D while walking by?
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