Swing out Sister 

Shit Pop Group from the 80's had 1 hit then vanished.Like a lot of 80's stuff has. pitty u2 are still around!

swing out sister are gone forever unlike Enya

Swing out Sister by Barfie the Corndog May 4, 2006

Step-Sister Syndrome 

A girl who is very attractive but due to more attractive sister(s) or long term friends has not gotten exposed to people thinking she's hot since they all go for the sister or friend. Usually consider themselves ugly and like in Ugly Duckling Syndrome have good personalities and will date any guy because "Looks aren't important" and they have a good sense of humor.

Originates from Cinderella.

Aaron: Amy you're hot
Amy: No I'm not, my sisters are and I got the shitty genes
Aaron: Want to come over later?
Amy: Sure, your funny.
Aaron: Hurray for Step-Sister Syndrome

Step-Sister Syndrome by Seraphim14 April 14, 2010

burns' sister 

a really really hot girl...who is burns's sister. synonyms 27, alex burns, burns's other sister's sister, the 3 to the power of three, and sometimes the number 15

Burn's Sister almost gave me a high five, but later she hit me in the shoulder

burns' sister by Alejandro Colissimo tha 2nd October 22, 2003

Lesbian Sister 

A female sibling who is acustomed to liking women. this attraction eventually developes into an obsession, and the now lesbian female is unable to be stopped

i fucking hate my lesbian sister

Lesbian Sister by Sam June 10, 2002

going sister  

when a woman loses all control.

Nicole was going sister on him when she found out he was stepping out on her.

going sister by Deborah Liberatore August 20, 2007

double sister twister 

when two lesbos scissor and make out at the same time while twisting there fingers around in there buttholes

kelsey and her girlfriend double sister twistered eachother yesterday it was nutz.

double sister twister by pussyeatertothemax December 3, 2010

stable sister 

TWO or more hookers WHO aresharing the same PIMP

Me and my stable sister Jackie ARE about to HIT THE BLADE & GET YO MONEY SWEET DICK DINO

stable sister by Cherry Cola6868 August 29, 2017