A monkey has diarrhea, your intestines are twisted up.” In Chinese, the word for diarrhea combines the extremely common action verb commonly rendered as pull with the word for belly. So diarrhea is a literally a ‘pulled belly,’ or if used as a verb ‘pulling the belly.’ What's more, in Chinese culture, the ‘deepest aspect of a person’ is usually their internal organs. In this case, it’s sort of like telling someone in English that they have a “twisted mind,” i.e. they’re depraved, crazy, or something like that.