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
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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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The word SL is pronounced "Slu" it sounds like slut but it has no connection what so ever. This word mean skinny legend
by amelga January 7, 2020
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That dude is totally a SLS. Yeah, he doesn't even bother to learn to do that shit properly...
by joqqeman November 26, 2015
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Abbreviation for "So like Sup?"

Which then means "So like what is up?"
Alex: sls pal?

Dilan: just chilling. sls with you?

Alex: Same.
by jayzzzzzz May 20, 2009
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SwintonLads (small gang in swinton, mexborough known by many of the swinton watch members)
“Stay away from the swintonlads as they are some scary chaps

“The swinton lads are a menace to swinton and our townspeople”

“The SL are some scary people
by Jack #SL September 26, 2020
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