Crowe's Constant 

A multi-universe theory, similar to Murphy's law, that essentially states anything that can be altered by freak scientific accidents/discoveries will indeed be changed forever.

It's a scalar value that actually increases and decreases as function of the proportional distance to Dr. Crowe.

Common phenomena explained by it include:
Faster than the speed of light gravity
Missing dissertations
Infinite positions for the coefficient of friction
Multi dimension travel
Missing Singaporean scientists

Student-"Dr. Crowe, I just heard that scientist think the graviton is mediated by a faster than light force, pretty cool stuff but kind of outlandish don't you think?"

Dr. Crowe- "This is big...."

Student- "I can feel the Crowe's constant building"

Crowe's Constant by Fromthefuture April 16, 2011

Danir's Constant

The eerie feeling that someone or something is following you as you walk up basement stairs. Coined when Reddit users DannyMacho and Im_Tapirs named the phenomenon on Reddit.

My friend is a victim of Danir's Constant every time he gets done doing laundry.

Danir's Constant by CoolHandLuke41 November 21, 2013

Hegmann's Constant 

The Hermanns constant 532nm, which corresponds to the wavelength of light from a green laser pointer. Denoted as lambda_h

"Using Hegmann's constant, determine the energy of a photon from a green laser pointer"

Hegmann's Constant by ThePilot22 March 31, 2023

skinner's constant 

Noun. The constant is whatever numbers you need to juke the stats so Professor Skinner is happy.

The data make no sense, so let's apply Skinner's Constant and go home.

skinner's constant by WoodleyPark April 11, 2023

Peter's Constant 

8*10^0

Person 1: What's 4+4?
Person 2: Oh, it's Peter's Constant.

Peter's Constant by dalaundryroom February 22, 2024

Roth's natural constant

Roth's natural constant by M. Roth (*2003) is defined as b=0 as an assumption for every too complicated mathematical equation with parameter determination.

Find the coordinates of P (a+1|1-2a|2a) which has the distance d=3 from the plane A: 4x-4y-2z=2.

Answer: a=b=0 because you have no idea what belongs in there so you use Roth's natural constant for a.

Roth's natural constant by fml_whatidohere January 10, 2022

man of constant sorrow 

Song on O Brother, Where Art Thou?

I am the man of constant sorrow, Ive seen trouble on the brink.

man of constant sorrow by Traveling Bob July 30, 2006