口不择言

Explanation: So he remarks that when the words can not express or that the right to speak casually 　　Usage: The main predicate; as predicate, object, adverbial; for emergencies 　　Source: "History of Wei Ailing Bozi Hua Chuan North": "Sex is very Bian Ji, when the emergency has, Koubuzeyan hand from the pounding." 　　Examples: This past week he actually ~ how can he say that! ★ Guo "Wenji" Act