when girls say that they are "sisters for life" and get to carried away with it. they put it in their aim profiles and probobly say it to eachothers faces.
"OMGAWD. Ilu soooooooooo much! S4L!!! 4aeaeaeaeaeaeaeaeaeaeaeaeaeaea!!! omg!"
by emily on February 17, 2006
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Single for life. You not going to have a signifigant other ever!
"What's wrong him?"

"Someone told him that he was going to be S4L and now he's crying in the corner rethinking his whole life
by RapidOxidation October 14, 2014
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SLUTS FOR LIFE!!

Group of annoying biotches

They think everyone loves them when actually everyone really hates them.
I work at the strip club and one day want to become a member of the S4L!

The S4L is so cool!! OMG! Can I get in the car and ride with you?! You are just so god damn cool!
by littlebunnyboomer March 18, 2008
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A way of saying Maddy & Sky 4 Life. i love u bestiee
Example 1---- Some boys: Damn, is that Sky and Maddy? there hot. Example 2---- Some Girls: Is that M&S4L? There so cool
by Big.Mama.Skyy February 5, 2022
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Slang 4 Life. Real fuckin trap shit. Type of motherfucker who always slanging shit.
Dat dumb mfer on that S4L type shi.
by Hahaloserz July 11, 2023
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S4L means "Shark 4 Life".

The Romanian YouTuber "Highman" calls his community ,,the sharks". Saying you are Shark 4 Life is a way of saying you are a fan of his and part of his community.
"Cristian: I am S4L!
Daniel: What does this mean?
Cristian: I am a shark for life, a fan of Highman!
Daniel: Oh, cool!"
by -cS-XENOX June 20, 2022
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