by Idk and idc March 2, 2014

Literary just a term created by the users on reddit that just means a subreddit that is similar to another subreddit that they created. It is also shortened to "Sister sub".
by GROVEnotusedb4 May 31, 2020

by Sir jay dom August 14, 2017

When someone is hit by a nun with a bible or yard stick for swearing at church/school. Also applies to when one's biological sister whips him/her with a long object.
Person 1: God***n it!
Nun: (Slaps person 1 in the face with bible)
Person 1:Dude I got sister whipped at home
Person 2: LOL
Nun: (Slaps person 1 in the face with bible)
Person 1:Dude I got sister whipped at home
Person 2: LOL
by airsoftkillm March 4, 2011

by LunaJade April 3, 2015

a sister who is also a best friend, or a friend who is closer to you than a friend and is more like a sister.
My sister, Kim, is also my best friend; she is my sister-biffle!
I love my friend Kristin so much, we are such good friends that she is more like a sister to me; she is my sister-biffle!
I love my friend Kristin so much, we are such good friends that she is more like a sister to me; she is my sister-biffle!
by BAD1484 May 13, 2010

Women who all have a child with the same mans sperm and support each other for the sake of the children.
"We didn't know too much about each other, but now that we're sperm sisters our sons have the right to know their brothers from other mothers"
by milk9837 October 18, 2011
