SLS 

Stands for 'Slit Lip Syndrome'; very common trait involving someone with a lip size equivalent to a slit or a sheet of paper; Most noticeable when lips are closed or when a person expresses a dominant grin

"Did you kiss him?"
"I did, but because he has SLS I got a lot of teeth and gums."

George Clooney and Amy Schumer are just a few celebrities who have 'SLS'.

SLS by momopeachgurl November 21, 2016

SLS 

Simi Lan Sai - Literally translated from hokkien it means what penis shit? It's an expletive that means roughly the same as "WTF?!?"

A: Dude! The chick you banged last night was a guy!
B: SLS?!?

SLS by havok March 21, 2005

SLS 

Swagging Like Shit

Girl: I Look So Swagg! (:
2nd Girl: SLS

Boy: Sahn That Girl Got Style!
2nd Boy: She Be SLS!

SLS by SweetesOfAll January 8, 2012

SLS 

Shawnigan Lake School: An old Canadian drug school that accepts students like Curly. *Rugby Gods

jack: yo I saw the new school you went to
matt: yea, it's SLS tier, smoking crack 24/7

SLS by lmfg January 6, 2020

SLS 

SLS - Space Launch System

The super heavy-lift expendable launch vehicle being developed by NASA to take humans back to the moon.

SLS will launch from Kennedy Space Center

SLS by JammieDodger705 January 3, 2021

sls 

A sls is a second life slut, this comes from the online game second life.

A secondlife slut tends to be over wieght, ugly and usaly over the age of 40 in real life.

Her second life avatar is slim, blonde, huge sexual features and tends to ware no clothing and have bought sexual gestures.

Boy: Damms shes sexy
Boy 2:shes proably an sls

sls by Korrie barker February 13, 2009

SLS 

An Acronym meaning
Sudden Leaving Syndrome.

Sufferers tend to have the attention span of a fish and leave conversations or internet chat. When not given attention or a discussion is not about oneself

But you can only apply SLS to a sufferer when the given person leaves unannounced or a very quick "bye" giving no time to initiate their departure.

Dave: "so.. Emily how's life?"
Emily: "Great at the moment, bit bored with scho..."

-During Emily's reply she quickly Turns around and leaves completely unannounced and unepected during conversation.

Another Example of SLS can be seen in Instant messengers
for example

*Emily Logs on to internet chat*
11:15AM Dave Says: "Hi Emily"
11:16AM Emily Says: "Hi Dave"
11:17AM Dave Says: "Hey what you doing tonight?"
11:20AM Emily Says: "not much mum wont let me goto this party so i think I'll sneak out"
11:20AM Emily Says: "BYE xo"
11:20AM - Emily appears offline -

SLS by David22212122 April 4, 2008