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
"Smile To Myself" - When you're not actually laughing (or feel that LOL would be overkill), but the text joke did get a smile out of you (internal or external).
A: "are you allowed to be nudey in a nudey theater?"
B: "good question! stm"
by WordNerd2 November 08, 2012
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
STM is slang for smiling to myself and is very similar to abbreviations like LOL (laugh out loud) and FTW (For The Win)It is one of the fastest growingly used words and next year will be added in the English dictionary.

Oh, and it is often mistaken for STI or STD (sexually transmitted infection/disease)
Nat.: Oh, remember that time with that teddy bear
Jess: Haha! STM :)
by berackk July 26, 2011
Standard Topless Makeout. The go to hookup situation for virgins, girls playing hard to get, Catholics, or conservative Protestants.
Dude 1: "Did you get any action last night with Kate after you left the party?"

Dude 2: "No more than an STM. She goes to church every Sunday and she may be trying to date me."
by mysteriousmd November 29, 2010
refering to the graffiti clique "Stop The Madness".orginating form the BAY AREA!!
Dude1:hey,look at that cool tag
Dude2:yup,STM did that
by JESUSLIVES!!!!!! March 26, 2009
stm stands for 'smile to myself'.
this is opposed to lol, 'laugh out loud'.
'cause who actually laughs out loud when they type it?

right, no one.
stm = the new lol.
kaye: 'did you watch the powerpuff girls last night?'
riyad: 'yeah, it was funny as. stm.'
kaye: 'stm.'
by Kayeeeee January 19, 2009
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