smh

The meaning of SMH is 'smell my hole', a more up-to-date way of simply saying 'get lost' or 'f*** off!'.

John: 'Yo, I stole all these candies from CandyHaven'
Marc: ' Dude that's my parents store!'
John: 'OMG, I did not know that! Anyway, you want some?'
Marc: 'SMH!'