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Where do donkey's lips come from?

The donkey's lips are not right for the horse's mouth ―― irrelevant/uncoordinated/far-fetched.

L-Khin Bodumuzu

[Interpretation] Metaphorical answers are irrelevant or inconsistent.

[Source] Songshi Daoyuan's "Jingde Dengchuan Record" Volume 19: "The donkey's lips and horse's mouth praise me for answering questions, and ten turns to five turns to spare you from the DPRK."

[Example] A paragraph is in a mess. (Qing Wenkang, Chapter 25 of Heroes of Children)