Cách sử dụng
The expression "barking mad" is used to describe someone who is crazy or insane. It is a common British expression, and can be used in both formal and informal settings, though it is more commonly used in informal settings. For example, if someone is acting very strange or doing something irrational, you might say "he's barking mad!". It's important to note that this expression is often used humorously, and is not meant to be taken too seriously.