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Jack's Sister 

A dirty liar who will tell you she's 13 just to sleep with you when she's really only twelve. She'll say that she loves you but really she only wants you for sex. Then she'll rip your heart out by leaving you for an older guy.
Did you get laid this weekend?
Ya, I slept with Jack's Sister!
She's just toying with you man.
She said she loved me!
She told me that to... Last weekend.
........oh.......
It's gonna be okay man... It's gonna be okay
Jack's Sister by Jack's Sister August 4, 2008

Ugly Sister 

A Jealous, and so, Ugly Sister. From whom she has a brother who is dating a girl that she doesn't like.
Also See: Little Bitch, and Ugly Friend.
I heard Ugly Sister doesn't want Brian seeing Alex anymore, so she told her brother no more sex love until he stops seeing her.
Ugly Sister really doesn't like the girl and is very jealous. She wants to BE her brother's girl. Instead of inviting her in, she condemned her out of the family.
Ugly Sister: "Hey Brian, When are you gonna dump Alex, she is so Ugly.!"
Ugly Sister by kissefemme September 15, 2010

scissor sister 

A woman who enjoys engaging in oral sex with another woman; a carpet muncher.
Ruth was a certified scissor sister.
scissor sister by sala January 17, 2003

not my sister 

a gorgeous woman who you have so much in common and love so much that she could be your sister
sarita is sooo crazy sexy cool im glad shes not my sister so we can have relations
not my sister by j-z August 9, 2012

Preach it sister 

A saying used when someone is ranting about something comparing their rant with a gospel preacher.
It can be a good or a bad rant, but the use of "Preach it sister" is often ironic.
Girl 1: I need feminism because rape.....
Guy 1: Preach it sister!

Guy 2: Xbox One is far superior to Playstation 4, its CPU...

Guy 3: Preach it sister!

twisted sister 

A twisted sister is a girl, typically in college and living in a dorm, who has "her boys" - a group of young college males who probably live on the same floor or in the same dorm as said TS.

She's the seemingly "cool", laid-back sister-type in this group of guys, but she's generally a boring bitch who's overprotective and maniupulative. She isn't romantically interested in any of these "boys," and they are not interested in her, but they hang out with her anyway and say she's "straight" because she makes them cupcakes and does their laundry or something.

Guys don't get it, and so they think this girl is "really cool" and "one of the guys" or "a good drinking buddy." But really, she's lame and uninteresting, and obnoxiously flaunts her unhealthy relationship with "the boys."

Defining characteristics of a twisted sister include - possessive, bland, annoying, posts numerous pictures on Facebook of her and "her boys" at clubs, has evil eyes, talks in stupid "gangsta" voice and takes numerous pics with a "gangsta" face/hand symbol.
Twisted Sister: "Oh muh gawd! This is a pic of me and muh BOYYYYSSSS! You bitches BEST be backin' up off muh BOYS. And I'm bein' RULL cute and makin' my pimp-ass gangsta face! WHUT!"
Normal College Girl: "Bitch, PLEASE. You're just a twisted sister."

Twisted Sister: "Bitch, you CANNOT date Tony! He's on of MUH BOYS!"
Normal College Girl: "Twisted Sister, shut up. He wants to make out with me, not you."
twisted sister by Leen May 9, 2006

Line Sister 

your sister who stands in LINE with you while pledging,not chilling in a classroom.
whos tha girl you were talking to?
oh thats gia my LINE SISTER, we put in work for our letters
ohhh okk!!!i see you!
Line Sister by macademianut215 September 20, 2012