你的脸皮好厚过拐弯的城墙
[nĭ de liăn pí hăo hòu guò guăi wān de chéng qiáng]
A sarcastic statement implying the other person has thick skin—meaning they are shameless or have very little sensitivity towards others’ opinions of them. In this idiom, 'thicker than even curved fort walls' exaggerates the trait being described.