blue joke meaning in Chinese

下流笑话

That professor likes to tell blue jokes
那一位教授喜欢讲荤笑话。
Among 144 jokes quoted and applied in new - found long novels gu wang yan in qing dynasty during classified expedition , preliminarily analyze and study over 90 jokes hereinto which have found out derivation or circumstantial evidences , especially a plenty of blue jokes and discover its cultural history
摘要在分类考察近年新发现的清代长篇小说《姑妄言》中引用、化（套）用的144则笑话基础上，对其已找到出处或旁证的90多则进行了初步分析研究，特别对其中大量出现的荤笑话现象，作了文化史解读。