Sister

You not my friend, you are my sister.

I love you sister.

by Nadiariincon July 10, 2018

Ariana (Big Sister)

Only job is to bully, and annoy Ebonie every day of the year.

Ariana (Big Sister) must annoy Ebonie, or she will as a sister.

by The Smartest Spunky Monkey July 3, 2025

Tree Sister

The TBHK AU where Kou is really sad and a tree kills his sister and stuff.
I have a really bad addiction to it.

“Do you know Tree Sister?”
“No.”
“You’ll know soon.”

by poIaris December 31, 2022

Standard Sister-in-Law Unit (SSILU) [300lbs]

Standard Sister-in-Law Unit
noun
*| \ ˈsta-ndərd ˈsi-stər-in-ˌlȯ yü-nət *
Abbreviation: SSILU
Symbol: 𝓢 or SIL

Definition:
An unofficial unit of mass equal to 300 pounds (136.08 kilograms), used to simulate high-risk, real-world human load scenarios in mechanical, structural, and transportation systems. The SSILU is commonly applied to test the failure thresholds of furniture, vehicle seats, elevators, bicycles, airline cabins, and public patience.

Etymology:
Originated in post-war American slang, the term is derived from the stereotype of a loud, heavyset female relative—often portrayed as emotionally volatile and structurally compromising—whose presence tests both family dynamics and infrastructure load-bearing capacity. While non-literal, the “sister-in-law” archetype evokes maximum physical and psychological mass concentration in civilian environments.

Technical Classification:
Measurement Type: Anthropomorphic Load Unit

Mass: 300 lbs (≈ 136.08 kg)

Field Use: Structural stress testing, emergency engineering simulation

Design Benchmark: Most consumer goods are not rated past 0.8 SSILU

“She hit the fitting room like a breaching whale—1 Standard Sister-in-Law Unit (SSILU) 300lbs in full stride, swatting children aside and hollering ‘THESE SIZES RUN SMALL!!! while nearby store associates quietly begged for a swift death

by Ludwig Von Snooterman June 7, 2025

Eats his sister

A euphemism for incestuous behavior, usually oral sex, with one’s sister.

“Alexander eats his sister every night.”

by RhodyRhodesRhodesia October 27, 2021

half-sister

Female that has one parent in common with another living being.

My half-sister is a good person.

by Sonyc September 22, 2023

Sister Switcheroo

A group of LGBTQ nuns.

Gee those fags are dressing like catholic nuns. I believe it is the Sister Switcheroo.

by The RONA Wigger October 3, 2023