by Caroline Might Fine November 14, 2016
by One Six One February 6, 2008
“what’s up, sis”
by kaitlyn pender January 24, 2019
1) Short for sister
2) In the song Fuck the Pain Away by Peaches, SIS seems to stand for Stay In School...
2) In the song Fuck the Pain Away by Peaches, SIS seems to stand for Stay In School...
by wxynot July 13, 2005
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.
by ChocolateWafflez April 15, 2015