驴唇马嘴　

◎ 驴唇马嘴 lǘchún-mǎzuǐ

[be beside the point; farfetched answer or reasoning] 比喻胡说八道

驴唇马嘴夸我解问,十转五转饶你从朝。——宋· 释道原《韶州云门文偃禅师》