1. short for "Dick Sucking Machine". used primarily as an insult
2. short for "Diagnostic and Statistical Manual" of mental disorders. can be seen in the movie "The Exorcism of Emily Rose"
Alex: Whoever helped u pick your colors must be a DSM
Gamer 1: dude, you just got pwned
Gamer 2: STFUDSM
(excerpt from "The Exorcism of Emily Rose") Lawyer: SUMMON THE DSM!!