剑桥词典written abbreviation for rolling on the floor laughing : used, for example in an internet chat room , to show that you think something is very funny 笑得在地上打滚；非常可笑，令人捧腹（网络聊天室用语，rolling on the floor laughing的缩写，表示觉得某事非常好笑） 返回 rotfl