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

The usher is the groom's brother-in-law s.i.

by mother-in-law s.i. September 1, 2018

(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 3, 2009

Notre Dame Academy High School S.I

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

S.I.

A Smelly Indian

Smelly Indians, or people with Turbans with unreal stench.

Manavpreet and Harpreet are such S.I.'s

by automatic.armadillo.42 May 14, 2022

S.I.

Smelly Indians

People from the country of India or Punjab who reek horrible stench.

Especially people with turbans.

Manavpreet and Harpreet are such S.I.'s.

by automatic.armadillo.42 May 14, 2022