sis

Short for sister, commonly used as a term of endearment to friends in urban new york/jersey areas

hey, sis, whats up

sis

Not meaning “sister”. Commonly used to refer to a close friend or bestfriend.

“what’s up, sis”

SiS

Suffering in Silence

Im alone now.. SiS.

sis

1) Short for sister
2) In the song Fuck the Pain Away by Peaches, SIS seems to stand for Stay In School...

My sis went to the movies with a scumball.

"Stay in school... Cause it's the best..."

sis

Slang for sister

Me and my sis went to the movies.

SIS

Abbreviation for: "Sisters, In, Spirit". Your Best Friend or Bae. Usually used to refer to someone really close to you, someone you spend a lot of time with, like your sister.

Girl: OMG, squad on fleek!
Girl 2: yas, we look #Fabulous
Girl: Yas Sis Yas!

SI

Abbr. for 'stupid idiot'

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