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

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

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

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

Sister Golden Hair

Well, I tried to make it Sunday, but I got so damn depressed
That I set my sights on Monday and I got myself undressed
I ain't ready for the altar but I do agree there's times
When a woman sure can be a friend of mine
Well, I keep on thinkin' 'bout you
Sister Golden Hair surprise
And I just can't live without you
Can't you see it in my eyes?
I've been one poor correspondent
And I've been too, too hard to find
But it doesn't mean you ain't been on my mind
Will you meet me in the middle?
Will you meet me in the air?
Will you love me just a little?
Just enough to show you care?
Well, I tried to fake it
I don't mind sayin', I just can't make it
Well, I keep on thinkin' 'bout you

Sister Golden Hair surprise
And I just can't live without you
Can't you see it in my eyes?
Now I've been one poor correspondent
And I've been too, too hard to find
But it doesn't mean you ain't been on my mind
Will you meet me in the middle?
Will you meet me in the air?
Will you love me just a little?
Just enough to show you care?
Well, I tried to fake it
I don't mind sayin', I just can't make it

by Death Menace April 26, 2023

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

Sister

Someone who made a definition about me, that has brown hair and blue eyes, about Avery labels.

My sister eats Christmas trees

by 👍🏻😂😖🥶😏😢😄😎😂 December 3, 2022