Classic internet jargin which is usually more appropriate than lol, for if you were to laugh out loud at everyhing slightly amusing on the internet you would not only be a fool but you would hurt your jaw. Anyway, STMS simple means Smile to Myself
Random1: slighty amusing sentence
RamdomIdiot: LOL!!
RandomSanePerson: STMS
by MrDanger January 11, 2005
Top Definition
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 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
"Speak to me", Used as a greeting when answering your phone
Phone rings!

Daniel: "STM!"

John: "Hi Daniel, I was just ringing you to ask you if your going to the patch tonight?"
by Stabber of loughshinny July 04, 2009

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