Si 

Is an abbreviation for Stupid Idiot, not to be confused with a nickname for someone called Simon.

You fucking Si; get 'ere now you Si

Si by SkiddyUnicorn29 July 25, 2022

SI 

Short for Survival Instinct - the ability to know what to do to stay alive.

His SI stopped him from committing suicide.

SI by Reality Unearthed March 24, 2023

SI 

In fanfiction, an acronym for self insert

He wrote a Pokémon SI story

SI by OrbitalDefinitions April 30, 2024

Si 

It means special interest. Another term for favorite.

Person 1: Yo Bungou stray dogs is totally my si.

Person 2: Me too bro, me too

Si by lil_peep_ enthusiast March 19, 2025

sì 

sì is yes in italian

A: Sono bello? - Am I beautiful?
B: Sì - yes

sì by falcon's March 15, 2021

Sǐ

Most common word used in Asian households

Sǐ

Sǐ by GermaniumL November 17, 2025

si goggly 

used by hillfolk in appalcachia, for crooked or not srtaight.

i.e) That road right cher is si goggly.

si goggly by hilltophero July 29, 2011