quarter sister

The half sister of my half sister or half brother.

Amy and Randy had Josie. Randy and Patty had Vanna. Patty and Bob had Andy.

Vanna is Josie's half sister.
Vanna is Andy's half sister.
Josie is Andy's quarter sister.
Andy is Josie's quarter brother.

by onegreenfroggie August 15, 2009

Stall Sisters

Ones (usually always girls) who may, or may have sexual encounters in a public - bathroom stall or public bathroom, in a public place. They do this because: they probably don't have any where else to go; it could be the quickest place to go at that time. Or their just that much of a dirty slut (smut), that they just have to "get it in", & it doesn't obviously matter where they have sex; as long as they get it over with.

Girl: "Whatever, they're Stall Sisters anyway. (;"
Girl's Bestfriend: "Oh, yeah ? Haha, whats that ?"
Girl: "Loretta fucked in a b-stall. Elaina looks like she was born in one. & Lacey smells like one. Therefore, they're Stall Sisters !"
Girl's Bestfriend: "Lmfaaaao !!!"

by michel3iisd0pe15 November 28, 2010

Stepish Sister

The daughter of your dad's (or mom's) significant other.

When I visit my dad I stay in my stepish sister's room.

by Cowboy Pete August 22, 2010

flamingo sisters

a group of girls who need a break away from the hubbys and kids...

a gang of girls who calls them selfs the flamingo sisters

by a flamingo sister September 7, 2008

shaft sisters

When two girls have had sex with the same guy

"Stacy, did you fuck Josh?"
"Yeah, last month"
"Dude, I fucked him, too!"
"We're shaft sisters!"

by julierileys April 19, 2015

Spear Sisters

Refers to two women who have slept with the same man.

Woman 1: how'd you score those free drinks?
Woman 2: the bartender and I are spear sisters.

by Picklesandbacon June 13, 2015

menstrual sister

one of two (or more) women who happen to fall on the same menstrual cycle. Menstrual sisters often times find comfort in sulking, eating, complaining, and causing a scene together.

My menstrual sister, from the stall next to mine, threw a tampon at me as I kicked my door in anger.

As a good menstrual sister, I shared my chocolate as we bled and weeped together.

by PrincessGaylordFocker December 11, 2016