Cranstant 

The distance between a woman's inner thighs at her crotch, measured in finger width, if she is standing with her feet at shoulder's width apart. A woman must be naked or wearing tight fitting pants, shorts, swimsuit, etc. in order to estimate her cranstant. The measurement is based off of how many average size, adult male fingers you would be able to fit between her legs at her crotch.

Wow, that girl has a perfect, 2-finger cranstant!

Cranstant by board4real November 22, 2010

Wadsworth Constant 

The Wadsworth Constant is the fundamental idea that the true meaning of a video, conversation, or comment approaches importance after approximately 30% of it has been skipped over.

The above definition, for instance, has 180 characters. After applying the Wadsworth Constant, we skip over 52 characters (29%). The definition now reads,
"the true meaning of a video, conversation, or comment approaches importance after approximately 30% of it has been skipped over."

Wadsworth Constant by ShigalHammoud October 2, 2011

Karpathy Constant 

The Karpathy constant is one of the best learning rates for the popular Adam (deep neural network) optimizer. It is defined as η = 3e-4. The actual symbol for the constant is α_k.

What is the correct learning rate for adam in this case?

Just use the Karpathy constant dude

Karpathy Constant by WonderingNeuron November 23, 2017

Jens's Constant 

The result when summing all the divisors of the numbers from 1 to 9. Seems to be a fundamental constant of nature, since it occurs many times on the Internet.

Youtube Poll:
69% yes
31% yesn't
Jens's Constant, nice ( ͡° ͜ʖ ͡°)

Jens's Constant by sevenfour March 2, 2021

Bulgarian constant 

Basically anything which makes your result correct. (In Bulgaria they call this "coefficient of adjustment".)

your actual result × Bulgarian constant = expected result

Bulgarian constant by tomask July 7, 2021

Minecraft universal constant

This number is a gigantic number coined by Austin from "The Science" series of Game theorists youtube channel . It is the number of all permutations in all minecraft worlds. Its value is 10^10^10^1.3134

Hey, did you see the mind boggling gigantic number, The minecraft universal constant, that Austin from the game theorists calculated.

Minecraft universal constant by LORD ASHU December 10, 2020

Cantanta

Cantanta is a singing group that I am forced to go to by my mum

Ellie: You doing anything later?

Rebecca: Yeah, I’m going to Cantanta.

Cantanta by I.make.weird.definitions January 23, 2019