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'.
by momopeachgurl November 21, 2016
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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?!?
by havok March 21, 2005
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Girl: I Look So Swagg! (:
2nd Girl: SLS

Boy: Sahn That Girl Got Style!
2nd Boy: She Be SLS!
by SweetesOfAll January 8, 2012
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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
by lmfg January 7, 2020
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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
by JammieDodger705 January 3, 2021
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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 -
by David22212122 April 4, 2008
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Short legged syndrome. A condition where the legs are disproportionately short compared to the torso. This is not dwarfism, but rather a physical trait confined to the legs. SLS is a cause of women not becoming models and men being insecure. Cases of SLS are prominant in certain geographical areas and rare in others.
It's a good thing your girlfriend wore her 4" heels. Otherwise her SLS would have stood out.
by Megatron1969 November 17, 2009
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