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.

Voluntarily Celibate.
A person who chooses to be celibate. Can be for any given amount of time, for a short period or for their entire life. Can be for religious reasons or not.

related: incel

Often said on IRC, this is short for "salaam", or hello.

People from Malaysia, Indonesia, Turkey, etc like to say this.

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.

sl stands for say less man. When you understand someone fully and clearly and you don't need any of their further explanation.

Slow and lonely masturbation, commonly taking place in bedrooms, bathrooms, dorm rooms, and locker rooms and resulting in a distinct smell.

stands for "Snake lives matter", which is a very important movement