醉酒说真话借醉吐真言
[zuì jiŭ shuō zhēn huà jiè zuì tŭ zhēn yán]
Drinking till intoxicated to tell truths using the drunkenness as an excuse. This suggests a context where under the influence of liquor, one expresses honest thoughts that are usually kept secret, revealing vulnerability or sincere emotions in the cover of intoxication.