SMD while I SMH

SMD while I SMH literally means, suck my dick while I shake my head. It's a word that describes your utter disappointment for blatantly disrespectful dick riders.

Dumbo: "Shut up dork"
thatboytweaking100%: "I thought you had something better to say. SMD while I SMH"

im jus trynna build a clothing rack smh

means they wanna have seggs

person 1: im jus trynna build a clothing rack smh
person 2: oh so you wanna get in bed?

person 1: ohhh yeaaa