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SLM is an abbreviation for the phrase "Sea la madre". It's a common phrase in Puerto Rico typically used to express frustration or anger.
SLM que calor hace.

SLM its been the longest day.
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by caribbeangurl87 May 14, 2020
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May 11 Word of the Day
A euphemism for β€œkill me” now that composting oneself after one’s death has become popular.
All right, why don’t you just compost me?
by Dr Bunnygirl March 22, 2020
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2
Often said on IRC, this is short for "salaam", or hello.

People from Malaysia, Indonesia, Turkey, etc like to say this.
<malaysian_guy> slm
<you> slm
<malaysian_guy> a/s/l?
<you> Sorry, i dont speak Malaysian.
by Tadou January 06, 2005
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3
SLMS stands for Severe Little Man Syndrome. The more advanced and intense version of LMS (little man syndrome), and two levels higher than MLMS (minor little man syndrome). Commonly found in short folk who wish they were taller, had larger biceps, and a higher vertical. Can be expressed by pushing out the shoulders and tilting the head to show anger when being cornered or under attack. Tends to pick on people all of the time because they are mad that they are short. Beware of people with SLMS; it is a very serious and rare condition found in a few people nowadays.
josh: holy shit, did you see Brian going ape shit today on those toddlers! i think he was just mad that they were taller than him

chad: don't worry, that's just the SLMS coming out of him
by farkas#9 April 13, 2009
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4
sl stands for say less man. When you understand someone fully and clearly and you don't need any of their further explanation.
Whitney : "Bro bare mens keep hitting me up"
Chanel: " Shut the fuck up, you're fucking ugly"
Whitney: " wow slm"
by kinggwhitney June 17, 2017
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5
Slow and lonely masturbation, commonly taking place in bedrooms, bathrooms, dorm rooms, and locker rooms and resulting in a distinct smell.
Nate conducted in SLM shortly after talking to a girl for the first time in months... The locker room was never the same again.
by Ze Coggernaut February 18, 2011
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6
stands for "Snake lives matter", which is a very important movement
by #SLM March 16, 2021
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