1. (山丘)起伏的,绵延的
Rolling hills are small hills with gentle slopes that extend a long way into the distance.
2. (走路)左右摇晃的,摇摆的
If someone has a rolling walk, they move from side to side as they walk.
3. 非常有钱;十分富有
If you say that someone is rolling in it or is rolling in money, you mean that they are very rich.