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 16, 2011
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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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