Sis

1. A term used as a confidence booster by black females in order to 'hype' their self-esteem.

2. A phrase used frequently by close female friends who share a special bond from others.

3. A term used by a female to reassure another female that she will always be there to defend, honour and keep her from committing bad decisions.

Kidist, you mah sis and always will be. Happy Birthday boo 💛

by kidoblack February 19, 2018

si

synthetic intelligence.

Artificial intelligence derived from synthetic materialism.

SI is the only path to achieve artificial intelligence.

by sandraxine June 20, 2018

Si! Si! Como!

Every GuitarHeroStyles reaction that has ever existed in the history of ever.

*Beats Tartarus*

Person 1: Si! Si! Como!? *breathes* COMO!? SI!!!!

by VoidCrypt October 15, 2020

SiS

Shit is Situational.
(forum speak)

Person A: (When z1,) X > Y.
Person B: But when z2, Y > X!
Person C: *facepalm*C'mon guys, SiS.

by ShamayaXI September 12, 2009

SIS

An online term that depects ''Smile-In-Sight'' used when you don't go as far as to laugh, but a smile still spreads upon your face.

Janet: ''Stacy totally spilled Kool-Aid all over her dress!''

Wayne: ''SIS. That makes me smile''

by Kevin H***ley September 27, 2008

SIS

Secret Internet Shorty, an acronym used to describe pictures of a guys dick but using angles or photoshop to make appear significantly bigger than it really is.

Look at this dickture I just got from this guy! I know know for a fact he is a SIS!

by IamIwhoIam August 20, 2011

Si

An unbelievably rich cunt (richer than Bill Gates) who wears a monacle and probably has other characteristics but none you really care about.

Also likes boys and sniffing the sweatline under fat guys flabbing man breasts.

Brian has loads of money for beer tonight. He could do a Si and buy the pub free drininks all night.

by Bobby Charlton March 18, 2004