The abbreviation "SMH" is most commonly used to represent the phrase "shaking my head" as well as variations of the phrase, including "shakes my head" and "shake my head." It is also less commonly used as an abbreviation for the phrase "so much hate."
The abbreviation "SMH" and the most common phrase it represents, "shaking my head," are used to express disapproval or doubt toward another person, thing or event. This acronym is usually used during conversation on the Internet or through text messaging, but it is also frequently used in casual conversation in-person. If used to represent "so much hate," it simply means that the person feels hatred for another person, thing or event.