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

Double standard

Double standards dont come from society, they come from people. Therefore any double standard in a female's favor usually come from females.

You could tell it bothered the female quick to point out other people's double standards to point out her own double standards, she still couldnt see how they made her as much of a hypocrite (or a narcissist) as everybody else (even males). A taste of your own medicine and shit isnt always delicious, is it?

by Solid Mantis September 18, 2020

Sub standard stand in

Some imposter look alike, faking their way thru life, pretending to be somebody on the east coast.

Paige, your guest is a sub standard stand in.

by ApolloX*12 August 20, 2024

APR-01 Standard

RFC APR-01 is the updated TCP communication standard used for 3WHS and is only available Annually on April 1st

Bro, the APR-01 standard has my tcpdump looking lit af

by twisty-networking May 18, 2018

Double standard

When someone lives to excess and has nothing but expanding dollar signs/becoming powerful (in real estate or new development, for example) on their mind, but also wants to wrap their tentacles around conservation efforts and humanitarian causes (such as social justice, income equality, sustainable energy, and a bunch of other issues they don't even hold sacred) to cover their tracks (and get credited for positive things) in case anybody questions (or stands up to) them.

The dorky bubbly girl claming to be a humanitarian and conservationist was one of the main reasons a lot of trees were missing, but she was too busy poking fun at other people's double standards to notice her own. She thought that humans were too responsible for global warming because she thought everyone else was trying to dominate or control the world's resources to the extent (excesses) that she was. She was arrogant enough to believe humans caused the last ice age, and that they were the sole reason for global warming, and the worst thing about somebody like her was that she didn't know it, she only saw arrogance in other people, which is the worst kind of arrogance, complete and total narcissism (the kind of narcissism that also only sees narcissism in others). The planet wasn't going to miss her when she was no longer a part of it and it's problems, but she would never see that either, because she had convinced the planet and the people living on it that they somehow needed her.

by The Original Agahnim November 23, 2021

Standard

When someone is good looking, but not EXTREMELY attractive.

"Did Jonny break up with his girlfriend?"

"Yeah, he said she wasn't pretty enough for him."

" Are you kidding me? She's gorgeous, he's just standard."

by FACE0217 October 6, 2016

“Standards”

A way to describe a women that has unrealistic standards for a significant other.

Joanna has “standards” , it’s ridiculous.

by UpsideUnicorn November 25, 2023