It’s original meaning of SMH is Shaking my head but it’s new meaning is scratching my head
My friend volunteered me to go to the movies and my response after thing about it was scratching my head
SMH, commonly misunderstood as "Shake My Head," actually means "So Much Hunkiness." SMH is used when a man, or group of men do something so outstanding that the women around them are in awe, and can't help but to exclaim "SMH."
Look at those dudes, they dressed up like a zebra, and were attacked by lions. That is awesome - SMH. So Much Hunkiness.