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When they pass you in the hall at work, it's like you are invisible to them. Never any eye contact or acknowledgement that you exist, except for them not actually walking right into you.
I had a coworker who did this to me (and a fair amount of other people at work). She was young and pretty and had this approach to any guys a fair amount older than her. I wasn't trying to date her or even interact with her in any personal way...she just seemed to preemptively turn on her 'you are invisible' field to the many people she was not interested in. It was a bit odd, but effective.
I suspect that it was a defense mechanism due to her experience of many older men trying to hit on her. Better not to even open the door.