STM is an acronym for "Stop The Madness". It is often used to express suprise, excitement, frustration or disbelief of some sort.
"LeBron James just signed to the Miami Heat, STM" or "Have you heard Lil Wayne's new song? STM"
by J-Khan December 12, 2011
Smiling To Myself
To use instead of lol when you actually are not lol-ing and just smiling to yourself.
Msn Dude: Hey man, I lost my shoe today...
Msn Man: stm, you're a jackass
by Mandeep June 17, 2007
Stop Tailgating Me, a bumper sticker often found on vehicles of slow ass drivers. Seeing this bumper sticker makes you want to tailgate them even more than if they didn't have the sticker at all, basically it's superfluous.
Dude, that trucks got an STM sticker on it, let's tailgate 'em!
by SiERRAAAAAAAAAAAAAA February 02, 2008
Secret Tumblr Message from one blog to another. It's cryptic and personal. It's specific to the Tumblr.com mini blogging site
STM: I saw what you did there.
by KarsonK August 02, 2011
Sexually Transmitted Miracle

or and unwanted baby.
You're a STM
by Miow_epicness July 21, 2010
stm means short term memory

jack : i forgot yersterday the jokes you told me
ben : you stm is it?
by lianms April 12, 2009
Smiling To Myself.
A more realistic saying for when someone says something funny over the internet as opposed to lol because no one is really laughing out laughing.
Gemma: I just fell down the stairs and broke my legs.
Kayleigh: STM
by kaygem October 05, 2008
Sexually Transmitted Marketing (STM). A viral marketing campaign that uses blatantly obvious sexual innuendo to spread itself across the internet and/or social networks, leaving victims of its tasteless imagery feeling almost as dirty as those who catch its biological counterpart (see STD).
Nadia: I think I caught an STM on Facebook yesterday, some new "NutLiquor" vodka that was "69 proof" and had "no salty aftertaste"

Marc: You should get that checked.
by someguy2012 November 09, 2011

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