by Nellie45 November 22, 2022

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.
by n_u_m_l_o_k September 29, 2020

by MikeNaz August 27, 2017

by Alt_Queen May 13, 2018

by Wilson sister lover September 14, 2020

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!
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
