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1.
SLS
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.
by Katty kat October 29, 2007
 
2.
SLS
Smiling like shit. (Internet Acronym)
Just met Idris Elba... SLS
by ponybitch December 12, 2010
 
3.
SLS
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.
by IAMGONDOR April 02, 2011
 
4.
SLS
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!"
by The4nimal September 15, 2011
 
5.
SLS
Swagging Like Shit
Girl: I Look So Swagg! (:
2nd Girl: SLS

Boy: Sahn That Girl Got Style!
2nd Boy: She Be SLS!
by SweetesOfAll January 07, 2012
 
6.
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?!?
by havok March 21, 2005
 
7.
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
by Korrie barker February 13, 2009