23.
One who pretends to be good at a particular sport, but in reality cannot play it whatsoever. Can be used in a sentence with yayaya with severe sarcasm.
Also can be used as an insult term in basketball to an opposing player on the court who cannot play according to regulation(s).
"Yayaya! Way to shoot that airball, you're not STM."

or

"I enjoy the way you got blocked at today's game. Continue with your STM-ness and you'll be an all-star soon!"
by Thomas December 03, 2003
 
1.
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
 
2.
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
 
3.
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
 
4.
Sexually Transmitted Miracle

or and unwanted baby.
You're a STM
by Miow_epicness July 21, 2010
 
5.
stm means short term memory

jack : i forgot yersterday the jokes you told me
ben : you stm is it?
by lianms April 12, 2009
 
6.
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
 
7.
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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