si 

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

i think he si very nice

si by winnie foster November 16, 2017

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.

SI by FancyDuck December 3, 2018

Si 

When you have no idea what the fuck your Spanish teacher is talking about.

: ¿Más preguntas?
: Si
:¿Cuál es la pregunta?
:Si

Si by I got a 7 in Spanish ab June 11, 2020

SI 

Sick Invite ( thank you for the non-invite )

You went for sushi!! SI (sick invite)

SI by 1-888 khod December 31, 2020

Si 

the kinda deals that make you boogie

Si

Si by big bald obama September 30, 2021

SI 

A shawty or girl

Wtw si🤔

SI by Urbanblackuser December 14, 2021

si 

si deez nutz

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

si by nuttynutty January 15, 2022