What does SMH mean?
"shake my head"
Other definitions of SMH:
shake my hand; SMH can be used to insinuate a handshake through message or texting in order to show that you have reached an agreement or deal
shaking my head
Signal Message Handling
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How to use the term SMH:
"Some people are so dumb, all I can do is SMH."
"SMH at having to explain what SMH means to my dad."
More slang terms:
For future reference