simulstance 

an even that happens simultaneously with others.

We are familiar with a hella lot of simulstances.

simulstance by uttam maharjan March 17, 2012

simultaneous trumpfinger 

A now popular occurrence describing the phenomenon of a group of people flipping an emphatic bird at the same moment, often at the mere sound of 45’s voice.

Simultaneous trumpfinger, while watching the news, has become a family bonding experience in our household.

simultaneous trumpfinger by Dr Bunnygirl September 15, 2020

simultaneous equation 

equations involving two or more unknowns that are to have the same values in each equation.

If an equation has two unknowns, such as 2y + x = 20, it cannot have unique solutions. Two unknowns require two equations which are solved at the same time (simultaneously) − but even then two equations involving two unknowns do not always give unique solutions.
This gives us a 'simultaneous equation'

simultaneous equation by rieazen September 9, 2014

simultaneous snoregasm 

Profoundly peaceful sleep shared by a couple after lovemaking.

Feeling what he knew would be her final orgasm of the night, he joined her, in perfect sync, and they fell into a state of simultaneous snoregasm, neither of them stirring until sunrise.

simultaneous snoregasm by Monkey's Dad February 27, 2020

simultaneously 

adv. - to do at the same time.

I masturbate and watch porn simultaneously.

simultaneously by Masterion August 2, 2011

Simultaneous release 

when one concurrently urinates and defecates; referenced in the song "Dani California"

I would sure rest in peace after a simultaneous release.

Simultaneous release by prague1 June 30, 2006

simulance 

similar to, having similarities

The only simulance between the two political parties is they both lie.

simulance by mindless February 6, 2013