A group of followers who believe Scott Peterson is Innocent.
Members of the sii group are quite intelligent.
by Rays November 29, 2006
Get a sii mug for your Facebook friend Georges.
SIY stands for

S= says

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

Person 1: I’m tired of all this childish people

Person 2: SIY
by Mfteea April 30, 2019
Get a SIY mug for your boyfriend Manley.
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.
1. Fuck this SIY Ikea shit!

2. SIY, I'm not touching that.

Combination: SIY, I bet she goes for premature ejaculators.
by Innominate April 30, 2009
Get the SIY neck gaiter and mug.
basically it's Yis Boi but in reverse
Are finished in the assignments?
Siy Iob
by yokaipiero January 08, 2021
Get a Siy Iob mug for your father-in-law Abdul.
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.
Girl : I don't wanna send you pix of me in a bra...i'm self concious :/

Boy: Uhh SIU SII SMD...

Girl: wtf...
by lizbrez March 22, 2009
Get a SIU SII SMD mug for your mom Zora.
one full definition that can define the laws and physics. One true word that balances into one and it is "THICCC"
Siii, you're thicc, but it's compliment of your avatar.
by Notyourmods November 19, 2020
Get a Sii mug for your fish Trump.