衣冠禽兽斯文败类
[yī guān qín shòu sī wén bài lèi]
This nickname expresses the irony and satire of people who appear to be decent but are actually corrupt. In traditional Chinese culture, '衣冠' (official attire) refers to proper dress and respectable behavior, while '禽兽' means beasts, which represents despicable character. This term highlights someone's hypocritical facade masking their bad nature.