s.i.

to be
derived from the latin "si" meaning "if"
alternative meaning: stupid idiot
as in brother-in-law to be ... if the stupid idiot ever proposes
by mother-in-law s.i. September 01, 2018
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(s.i.)

when text messaging, it is used for the idiots who don't understand that you're being sarcastic; means "sarcasm implied," and is often used at the end of a text message.
Janet: "Do you think Miguel was being serious?"

Miguel's text: "yeah i'm really excited to see you too (s.i.)"

Ted: "Of course not, he even put 'sarcasm implied' in the text! You must be really dumb"
by upsidedownchoking December 03, 2009
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A high school in which only girls attend. All the girls are beautiful, smart, and much much better in everyway then moore, villa, hill, sea, and all public schools. Usually like to party, but also know when to stop.
Mark: My girl goes to Notre Dame Academy High School S.I .
Dennis: My girl goes to Hill, let me see a picture of you girl?
*Shows picture*
Dennis: WOAH! Shes goregous!

Mark: she also is a party animal, and smart.
Dennis: Introduce me to her friends!
by Golden Eyes November 15, 2011
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S.I.S

S.I.S is an acronym for Special Investigation Section.

It is an Los Angeles Police Department's elite tactical detective squad with a straightforward mandate: Track down the City’s most dangerous offenders and take them off the street. S.I.S. are possibly the hardest-working, most dedicated men and women Detectives to wear a badge.
Alonzo: Hey, Mark, where are you transferring to?
Mark: S.I.S.
Alonzo: Yeah, S.I.S. Detective.
(from 'Training Day')
by KainJynez June 23, 2009
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s.i.s

Means to "sit in silence" insetad of lol. Usually used if somebody sais something retarded online, its a good way to be honest. Lets face it very few actually laugh at stuff online.
xXihateyouxX: i was like "duhhhhhhh" haha
ay u guys 2003: s.i.s
by mat a April 24, 2005
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s.i.s

suprisingly improved sequel
a movie is an s.i.s if

a) the original was brilliant,yet the sequel was better
b) the original was average and no one expected an improvment
c) the original was pure garbage and no one wanted a sequel. a monkey could make a better sequel but this sequel was actually really good
aliens and terminator 2 are s.i.s type a imo

mad max 2 is awesome, it is an s.i.s type b because the first one was quite boring

mate, the star wars prequels were such utter shyte, im glad revenge of the sith was better, it was a type c s.i.s
by evan4401 October 02, 2010
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S.I.S

Self inflicted shanks:
Stab wounds that one purposely makes usually to frame someone.
Dude 1: dude he shanked me!
Nigga 1: Naa dats just an S.I.S
dude 2: he was with me he coudlnt have done it
-dude 1 walks off angry-
by Brawlar December 05, 2008
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