Blood on the Dance Floor's song "S my D" from the album "It's hard to be a Diamond in a Rhinestone World", stands for "Suck my Dick!"
(Which they cleverly disguise as "Solve my Dilemma" on some of their older youtube videos).
S my D is also a commonly used word for many highschool aged teens to tell a girl (or boy) to suck their dick in an undercover form.
Also used as a comeback.
Person 1: it's your turn to do the dishes. Person 2: S my D