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Zeroeth Law 

A Zeroeth Law is a law that is added to another set of laws at a later date.

It is usually so important that the other laws cannot function without it, yet so obvious that nobody thought it needed stating.
The Zeroeth Law of thermodynamics: If objects B and C are both in thermal equilibrium with object A, then they are in thermal equilibrium with each other.

Isaac Asimov's Zeroth Law of Robotics: A robot may not harm humanity, or through inaction allow humanity to come to harm.

Newton's Zeroeth Law of Motion: If objects A and B are moving relative to object C at velocities v1 and v2, then they are moving relative to each other at velocity v3 which is the difference between v1 and v2. (Note: This law is now known not to be true, especially near the speed of light. That's where Einstein comes in)

The Zeroeth Commandment: Thou Shalt believe all of this and never question what thou art told.
Zeroeth Law by George McBob June 22, 2009
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veselekov's zeroth law 

A scientific law explicitly stating that all members of the female race shall be unable to be sexually attracted to any man who has full autonomous control of their eyebrows. This does not hold true for any relationship that remains at a platonic level, such as friendships, or even jogging buddies. Predates his first law of gas, grass, or ass: no one rides for free
Player 1: Man, that dude's eyebrows are going everywhere! he's even doing the wave!

Player 2: He probably suffers from veselekov's zeroth law
veselekov's zeroth law by veselekov October 14, 2012
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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