SI

Sick Invite ( thank you for the non-invite )

You went for sushi!! SI (sick invite)

by 1-888 khod December 31, 2020

SI

Means self insert. The character you use and identify yourself to have sex with your anime waifu.

-I'm going to write a fanfiction between my SI, Jackard Bigchub Maximus, and Sagiri-chan.
+Do it elsewhere. Disgusting.

by FancyDuck December 03, 2018

SI

A shawty or girl

Wtw si🤔

by Urbanblackuser December 14, 2021

SI

In fanfiction, an acronym for self insert

He wrote a Pokémon SI story

by OrbitalDefinitions April 30, 2024

si

when one is typing the word "is" really fast and without thinking.

i think he si very nice

by winnie foster November 16, 2017

SI

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

His SI stopped him from committing suicide.

by Reality Unearthed March 24, 2023

si

si deez nutz

person one: how do you say yes in spanish
person two: si-
person one: SI DEEZ NUTS U STOOPID

by nuttynutty January 16, 2022