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Big Sister

A big sister is a little sister that has grown up, and is no longer capable of collecting Adam from corpses. They are in a deep sea diver suit, just like a Big Daddy. They are able to use Plasmids, and have a large needle to take Adam and transfer it into themselves.
Eleanor: If I can survive, I’ll need to become like you. I’ll need to become a big sister.
by n_u_m_l_o_k September 29, 2020
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Fireman Sister

When two women have had sex with the same guy. Akin to the not-so-great male term “Eskimo brother.” So named this because the two women have both “slid down the same pole.” This act brings about a specially bonded type of sisterhood.
Jess: I got way too wasted and somehow hooked up with Brian last night.

Sarah: Ew gross. He’s horrible in bed but now we’re Fireman Sisters since I hooked up with him last year. Cool!
by Jam Sandwitcher July 21, 2022
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brother/sister asked a very good question

What you say when you can't answer a question someone asked you.
Originated from a meme based on a Muslim video of an islamic orator named Zakir Naik.
Person 1: Where are you going??
Person 2: Brother/Sister asked a very good question *goes away*
by noiwontwriteapseudonym April 15, 2025
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carousel sister

When two women have had sex with the same guy.
by Alt_Queen May 13, 2018
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Sisters girl

Amy is a sisters girl 100%
by 459395 March 28, 2023
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Wilson's Sister

Hottest girl in the world Belongs to H.H.
by Wilson sister lover September 14, 2020
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Creampie Sisters

Creampie Sisters are two women whose children are born on the same day, the year does not matter.
Hey we share a birthday!

That must mean our mom's are "creampie sisters"
by TheWarden_3634 March 23, 2024
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