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 #s.l.s. #sudden leaving syndrome #sudden leaving sindrome #suddon leeving syndrome #suddon leaving syn
by David22212122 April 04, 2008
Top Definition
Abreviation for the swinger/alternative sex/lifestyle website SwingLifeStyle.
I saw your mother on SLS last night, guess that explains why you don't look like your father.
#aff #swing #lifestyle #swingers #wife swap
by Katty kat October 29, 2007
Smiling like shit. (Internet Acronym)
Just met Idris Elba... SLS
#smile #happy #excited #joyful #siced
by ponybitch December 12, 2010
A fisherman's term meaning "sore lip syndrome". This commonly occurs 1. When a fish is caught and thrown back. 2. When fish is hooked but gets off the hook. 3. When nothing bites in a specific area because a big shot fisherman was there recently and hooked all of them. SLS can last for a good while. Unless the fish are dumb, and you're just lucky.
Example 1. Yeah nobody will catch him again for a while. That fish has SLS.
Example 2. Aw man he was a big one too. He won't bite again because of his SLS.
Example 3. Man the fish really aren't biting today. They may just have SLS from yesterday's fishing tournament.
#sore #lip #syndrome #fish #fun
by IAMGONDOR April 02, 2011
Proper noun

A boarding school situated in the middle of nowhere that only accepts guys who happen to be Catholic. The only sport that SLS excells at is soccer, being that roughly 1/3 of its population is mexican.
"Did you see how good those guys were at soccer? they must have been from SLS!"

"Did you see how well-dressed and well-mannered those guys were? they must have been from SLS!"
#sls #hill of happiness #saint lawrence seminary #saint lawrence seminery #s:s saint lawrance seminery #saint lawrance seminery #saint lawrance semenery
by The4nimal September 15, 2011
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
Swagging Like Shit
Girl: I Look So Swagg! (:
2nd Girl: SLS

Boy: Sahn That Girl Got Style!
2nd Boy: She Be SLS!
#swagg #girl #boy #style #sls
by SweetesOfAll January 07, 2012
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