SMH means Shaking My Head.
The Full Answer
SMH is a slang abbreviation that stands for Shaking My Head.
It is used to express disbelief and disapproval that…
somebody or something is really stupid…
or makes little sense.
For extra emphasis, you can use SMDH (Shaking My Damn Head)…
or SMFH (Shaking My Fucking Head).
SMH also stands for So Much Hate. This meaning is used to express disapproval of actions, words or ideas inspired by hate.
Where Would You See SMH?
In texting… and chat… and on social media, such as Facebook… and Instagram.
I can’t believe my idiot bf (now ex bf). He thought he could have some side action and not be found out smh.
The plans are cancelled? Oh no, I was all ready to go out too. smh
My girl told me I’ve got a stupid walk. All these years of walking and nobody told me. And now I’ve got to change my walk smh.
Other SMH Meanings
Sydney Morning Herald (newspaper).