SI

Abbreveation of Science and Industry, possibly the most popular Half-Life mod around.

'I'm sorry mum, i can't go and have a bath, im going to play SI'

'I'd rather play SI than CS'

by Anonymous June 26, 2003

Sis snapped

When someone finally snaps or gets angry at something

Omg. Did you hear the tea? Sis snapped

by Teabitch1!1! November 23, 2018

sis

A sis is a bump which women may get on their breast which is just a build up of fluid but often thought to be a cancerous bump.

My aunti went to the doctors yesturday to see about that bump on her lower breast but it wasnt cancer, it was a sis thank God.

by Justin [Future RAF Policeman] May 5, 2007

lil sis

Up and coming rap star and general celebrity, sidekick of Bubb Rubb. Famous for the WooWoo Remix, one of the hottest joints on the scene. Last seen on KRON News being interviewed about whistle tips.

Excerpt from WooWoo Remix:

The...whistles go woooo, woooo, woooo...the...whistles go woooo, woooo, woooo...Yeah, I gots one on my car...

by bubb rubb April 6, 2004

lil sis

Bubb Rubbs less popular side kick who needs to understand that a whistler tip is not a decoration cause u cant see it

we do it fo decoration man jus fo decoration das it and das all

by me August 23, 2003

Tea sis

When TanaCon didn’t work out. So tea is like the tea is the real gossip ❤️

“What’s the tea sis”Lily asked Alice

“

by Rjejjsjg January 26, 2019

Si-mon

A fabulously cool way of saying Yeah Man!

Hey dude! Did you check out that girls ass?

Si-mon!

by Senerenty March 1, 2005