A group of followers who believe Scott Peterson is Innocent.
Members of the sii group are quite intelligent.
by Rays November 29, 2006
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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
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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
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basically it's Yis Boi but in reverse
Are finished in the assignments?
Siy Iob
by yokaipiero January 08, 2021
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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
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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
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