stands for SELF MUTILATION and is also known as self-injury. (cutting or burning yourself. doesn't mean you're suicidal)
She does SM.
Sent Message while Shitting - A way of letting people know you're droppin' a deuce while texting them.
315: "pure liquid SMS"
434: "dude thats sick dont text me from the shitter"
The Steamboat Mafia. A gang that is usually associated with contract killings.
Dude! he got SM stomped
Shit its the SM!