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Short for the word “sister” but also just an answer to any question ever.
Susan: “how was your weekend?”
Janet: “sis...”
Susan: “omg sis what’s the tea sis—spill!”
Janet: “sis!”
Susan “sis”
—and so on and so forth until Antichrist comes and the world is over
by Theworldisflat.edu August 03, 2018
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Short for sister, commonly used as a term of endearment to friends in urban new york/jersey areas
by Caroline Might Fine November 14, 2016
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1) Short for sister
2) In the song Fuck the Pain Away by Peaches, SIS seems to stand for Stay In School...
My sis went to the movies with a scumball.

"Stay in school... Cause it's the best..."
by wxynot July 12, 2005
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Abbreviation for: "Sisters, In, Spirit". Your Best Friend or Bae. Usually used to refer to someone really close to you, someone you spend a lot of time with, like your sister.
Girl: OMG, squad on fleek!
Girl 2: yas, we look #Fabulous
Girl: Yas Sis Yas!
by ChocolateWafflez April 15, 2015
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1.) A South African English expression roughly equivalent to the American "yech" and the Afrikaans expression "sies".

2.) An American term of endearment for a sister, now also used in other countries.
1.) Sis, man, you stink!

2.) Hey, sis, hey bro, how's Ma doin'?
by Xaviana December 01, 2003
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Smirk in Silence:
The act of putting on a straight face after putting someone in a spot.
Pulling someone's leg as a group where everyone acts normal in a scenario that is funny.
Used on social networks, chat rooms and forums..at least could be!
Totally loved getting on Spook's nerves acting as if I don't know him at the bar last night. Pulled a SIS.
by far_c November 02, 2009
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