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During the Western Jin Dynasty, Grand Commandant Wang Yan was fond of discussing the philosophies of Laozi and Zhuangzi. However, his interpretations and arguments often changed casually, leading people to describe his remarks as '口中雌黄' (kǒu zhōng cí huáng), meaning he spoke inconsistently as if casually correcting errors with orpiment.
Once, he sought out Guo Xiang, who had a deep understanding of Laozi and Zhuangzi, for a philosophical discussion. Guo Xiang provided a systematic and thorough analysis of the philosophies, which left Wang Yan unable to interject. Wang Yan was so greatly impressed that he remarked Guo Xiang's discourse on Laozi and Zhuangzi flowed like a gushing river, never running dry.

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Open the tool →口中雌黄 (kǒu zhōng cí huáng) is a Chinese idiom (chengyu) meaning “to contradict oneself casually”.
口中雌黄 is pronounced kǒu zhōng cí huáng in Mandarin Chinese.
口中雌黄 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
雌黄:即鸡冠石,过去写字用黄纸,写错了就用雌黄涂沫后重写。随口更改说得不恰当的话。比喻言论前后矛盾,没有一定见解。