SIY stands for

S= says

I= it
Y= you
A way to say it so u can’t get noticed/hated

SIY is the counterpoint to DIY - Screw It Yourself. It can refer to one of two things:
1. A frustratingly difficult Do It Yourself exercise attempted by an unqualified 'handyman'.
2. A retort to a friend setting you up with a troll.

Combinations are possible.

A group of followers who believe Scott Peterson is Innocent.

basically it's Yis Boi but in reverse

The abbrevation for the commonly used phrase

"Suck it up, suck it in, suck my dick"

A phrase used by lovely guys with excellent manners.

one full definition that can define the laws and physics. One true word that balances into one and it is "THICCC"

one full definition that can define the laws and physics. One true word that balances into one and it is "THICCC"