SI

stands for self-injury. Aka cutting, burning, etc. for emotional distress reasons

Person 1- Did you SI today?

Person 2- I haven't hurt myself on purpose in like a week.

by Injuried November 8, 2010

sis

1.) A South African English expression roughly equivalent to the American "yech" and the Afrikaans expression "sies".

2.) An American term of endearment for a sister, now also used in other countries.

1.) Sis, man, you stink!

2.) Hey, sis, hey bro, how's Ma doin'?

by Xaviana December 1, 2003

SIS

a genderless term much like "bro" or "dude"

you don’t have to be BFFS. You don’t really even have to know them. If she seem chill. then SISSSSSS is what they should be called!

JACK: *texts Jill*

“ SIS! You’ll never believe what popped up on Greg’s phone!!”

Jill: “Girl, SPILL!”

Jack: “Some HOE’S NAME! Do you think he is cheating on me?!”

Jill: “ SIS! YES! Leave his ass!”

****you can also use it in less dramatic scenarios****

by URB@NL3GEND March 4, 2020

si

Short for "System International." Also known as the Metric System.

The SI system makes more sense than the English system. It should be officially adopted by the US, but we Americans are too lazy for change.

by BlastMaster June 12, 2003

Si

An awesome boy that is kind, nice, derpy, hilarious and clumsy and is a wonderful bestfriend.

Is that Si?!

by kjj-123 December 30, 2012

si

Its a model of faster model of the Honda Civic, meaning "Sport Injection"

My civic DX got spanked by that Si hatck.
or
Im bout to get me some Si rimz dawg.

by Tsugaru November 26, 2003

sis

short for sister

"HI SISTERS" = james charles

by emolay;) June 13, 2018