SI

Abbr. for 'stupid idiot'

As in Football Factory from 2004:
"Jog on, you si!"

by Nige Menzel June 11, 2007

Si

Yes

“Si”

by TwistyNoodles July 27, 2020

sis

the abbreviation of "sister";
a genderless term much like "bro" or "dude"

people can also say it like "sister" but that doesn't change the definition

like when you say "brother" instead of "bro"

-"How do you feel about celebrity drama?"
-"It's the tea, sis."

-"Hey sisters!" -James Charles

-"How u doing?"
-"I'm so fucking depressed, sister"

by Bakuhoe Katsubitch January 9, 2019

-sies

Suffix added to the end of almost every word. Used mostly by 40 year women talking to their children and/or dogs, or drunken college whores in a desperate attempt to sound more cute, less riddled with STDs and premature, substance induced age.

Ok, who wants napies?

Who's got tired little legsies?

by Ihateyouallsomuch July 31, 2005

SI

Abbr. for "self-injury," also known as self-mutilation. Most common form is cutting, but may also include burning, bruising, skin-picking (excoriation), and other behaviors. There is no single cause for SI. SI is most common in women and tends to persist for years.

As a result of overwhelming anxiety, she turned to SI as a coping mechanism.

by rieux November 27, 2003

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