n.

1. 滚原木
2. 水上踩滚木（游戏）
3. 【主美】互相吹捧；互投赞成票

n.

1. a sport in which two contestants stand on a floating log and spin it with their feet to try to dislodge their opponent.
2. informal the exchange of favours between politicians by reciprocal voting for each other's proposed legislation. [from the phr. you roll my log and I'll roll yours.]