SMH stands for 'shaking my head' and is an acronym used in chat conversations to express disapproval or disappointment. SMH is often used in a humorous way, but it can also be used in a more serious way to express genuine disappointment. It is often used in response to something that someone has said or done that is seen as wrong or foolish. It is a very common acronym used in online conversations and is a great way to express disapproval or disappointment without having to type out a long response. It can also be used to express disbelief or frustration....