Big sister

So-called 'second mother'; glorified slave of their younger sibling (especially if it's a brother)/parents

I don't have a big sister

by Hello-553669 April 19, 2025

Sister

someone you don't want to have a sexual relationship. EVEN IF YOU ARE IN ALABAMA

Guy 1: "Yo dude I got lucky with Elizabeth!"
Guy2: "Nice! Elizabeth Davidson?"
Guy 1: "Nah Wilson"
Guy 2: "Lucky! Wait, isn't she your sister?"

by DeputyCeoOfSex October 22, 2023

radiator sister

A woman who is a little rough around the edges but like a radiator in that she radiates or emits light, heat, & sound.

I like her style, she's definitely a radiator sister .

by MoreDirtyHarryThanGirl April 21, 2018

Beat up your sister day

You've always waited for this moment but you never had the occasion, now you do

Oh where are you sisteeeer, its timeeee, today is beat up your sister day

by Martichucho August 7, 2022

Sister in flaw

When your sister in law thinks she has diving board skills and can't even pull off a front flip.

You should of seen my sister in flaw embarrass herself at our subdivision pool.

by Webster 57 July 31, 2022

Step-Sister

A step-sister is when you get a handjob while behind the wheel of a right-side driving vehicle in ‘Merica!!

I just got my new SUV from London, my girlfriend gave me a ‘step-sister’ the first time I drove it in America!!

by T-town Gibby March 21, 2025

sizzle sisters

a popular girlband.

made up of carley, lori, and merrily.

“wow, have you heard of the sizzle sisters?! they’re so cool, but they need a drummer!)

by red apple ice December 30, 2023