The observation that when the number of individuals for a given party increases to 3 or higher, the increased likelihood that the desired outcome of the planned event will diminish.
Look like no one here at the party, where everyone? Mike and Marcos law!
Let's keep this movie event at 3 people to keep Mike and Marcos law from happening.
Let's keep this movie event at 3 people to keep Mike and Marcos law from happening.
by MardoMarket August 2, 2021
Get the Mike and Marcos lawmug. My aunt-in-law is a good person.
by KOBO8956 September 22, 2021
Get the aunt-in-lawmug. 
Get the step-great-grandson-in-lawmug. by Ubafool2believe February 14, 2024
Get the Husband in lawmug. 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
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
Get the Standard Sister-in-Law Unit (SSILU) [300lbs]mug. ice's first law of maps states that for every fictional map large enough, an area within it will resemble the Mediterranean even if slightly.
by icesuu July 9, 2021
Get the ice's first law of mapsmug. step-first-cousin-once-removed-in-law.
by Simaduria July 27, 2024
Get the step-first-cousin-once-removed-in-lawmug.