STM 

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!

STM by SiERRAAAAAAAAAAAAAA February 3, 2008

STM 

"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?"

STM by Stabber of loughshinny July 4, 2009

stm 

stm means short term memory

jack : i forgot yersterday the jokes you told me
ben : you stm is it?

stm by lianms April 12, 2009

Stm 

Smiling too much. When you’re smiling a lot while texting someone.

‘Oh my god I’m stm’

‘Jason was making me stm last night’

Stm by Babieeegirlll April 26, 2020

STM 

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

STM by kaygem January 17, 2009

STM 

Acronym meaning “Swear To Monk”. Nobody can ever lie on it. It’s a display of the highest form of honesty.

Xavier: Did you eat my cookie yesterday?
Josiah: Nah man STM I didn’t .
Xavier: okay sounds good, I wouldn’t have believed you if you didn’t swear to monk.

STM by ÃÜŠ February 11, 2021

STM 

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."

STM by mysteriousmd December 1, 2010