What does “roll off (of)” mean?

We were silent for the rest of the drive. I could feel the waves of infuriated disapproval rolling off of him, and I could think of nothing to say. (Twilight)

Tension rolled off of her, nearly visible in the air. I could feel the desire, the all-consuming passion that held her in its grip. Almost as if I could hear her thoughts, too, I knew what she was thinking. (Twilight 3 - Eclipse)

I could feel the tension rolling off Edward as he listened to Aro’s assessment of Carlisle’s words. The strain mounted as the seconds ticked by. (Twilight 4 - Breaking dawn)

The meaning of "Roll off (of)" in the context used means to emanate from or give out. It is associated with feelings.

I could feel the waves of infuriated disapproval emanating from him, and I could think of nothing to say.