1. Of a thing, to deflect or reflect off of a surface. I caught the rubber ball when it bounced off the wall. The light bouncing off of that mirror is blinding me—can we close the curtains?

2. Of a person, to tell something to someone in order to solicit feedback about it. In this usage, a noun is used between "bounce" and "off." I bounced the idea of becoming an actress off of my friends before discussing it with my parents. Hey, can I bounce something off of you guys?