Literal translation? “Oh, my cow!” Well, nothing happened to the cow! This expression which expresses surprise, excitement or admiration can be translated by “Wow!” or “OMG!”. It dates back to the 17th century. At that time, farmers were bringing cows into towns to guarantee that the milk they were selling was fresh. The residents, seeing their source of milk, would shout Ah! La vache! The exclamation became a very common expression and made its way into everyday conversation.
Don’t want to say Ah! La Vache!? Then you can say Oh là là!