meaning, "shaking my head", smh is typically used when something is obvious, plain old stupid, or disappointment.

Let me die.

the meaning is 'shaking my head' often used when you're disappointed or embarrassed.

shaking my head or

so much hate.

Stands for "small macaronni hat", which of course we all know is the most shameful headgear

acronym that stands for "shaking my head"

Acronym for 'shake my head' or 'shaking my head.' Usually used when someone finds something so stupid, no words can do it justice. Sometimes it's modified to 'smfh' or 'smmfh' by those that prefer profanity in their internet acronyms.