Instantaneous 

Refers to being insane and spontaneous

My friend is not insane nor is he spontaneous he is instantaneous

Instantaneous by Insane_s.a October 29, 2018

instantaneous 

That which occurs within the immeasurable time span of 1 instant. So quick you can’t even hear it.

K-“That’s crazy, the wood caught fire really quick”
E-“yeah, once the flame hit, it was instantaneous”

instantaneous by k & e July 7, 2022

instantaneous orgasm 

What happens to 12-year-old girls at the sudden appearance of Robert Pattinson.

John: How was your daughter's birthday last weekend?

Bob: It was going great, until the preview for that Twilight movie came on. She had an instantaneous orgasm.

John: Your daughter?

Bob: Her and my wife.

instantaneous orgasm by Slartibartfast11 December 11, 2009

instantaneous hornification 

The act of instantly becoming horny

le sees sexy lady
INSTANTANEOUS HORNIFICATION

instantaneous hornification by notarealpersonyesiam January 12, 2014

Instantaneous Verticality

When a function is continuous but has an undefined derivative.

That right there is instantaneous Verticality!

Instantaneous Verticality by Marett's Definitions Writer October 28, 2025

instantanus

When someone farts and you smell it right away.

For example " Damn Ricardo that fart was loud...yeah and I smelled it instantanusly.

instantanus by Seabag November 6, 2014

instinaneous combustion

something that suddenly enflames largely.

me:WOAH! my pants just went into instinaneous combustion!
you: niceeee mannn :

instinaneous combustion by -xoxo Deeeena love December 13, 2009