SI

Socially Inept.

Seen in episode 13 of "Rugrats: All Grown Up"

"Lil, your brother is what he called SI, you know, socially INEPT"

by Johnny Skeets September 18, 2005

si-an

Also Spelt Sharn.
si-an is a slang MSN term
for big chin
it also consists of a bob blonde boy cut
and 'thinking your indie'
Taking wrongly Shaped bebo photos covering your massive chin.

-SIIIII-AAAAAAAAAAN-
-whos? got a si-an?-
-looks at bebo picture-
-massive chin-

by Dropdeadchloe January 16, 2008

Sis

A sexual nickname between gang members.

Hey there sis.

by Gang guy 254 October 14, 2016

Sis

The ultimate friendzone

Short for sisters

1- hey

2-hey sis

by Mandagrace99 November 24, 2018

sis

The Queen Bitch Hacker

"Sis & Sabbath Own you"

by Sis March 8, 2003

Sis

A word basic bitches use to get a point across.
It’s the most cringe worthy word that can be used and should be illegal in every way.

“Omg sis I just got a brand new Rolex”
“Sis hop in my fiat500 let’s go for a ride”

by Shanosthetranos July 6, 2020

Sis

A sexual nickname used by gang members

Hey sis

by Gang guy 254 October 14, 2016