spontaneous regularity 

(n.) diahrrea, often of the explosive and unpredictable sort.

What Donald thought was a fart had turned out to be a bout of spontaneous regularity.

spontaneous regularity by Blenderhead91 April 10, 2009

Choreographed spontaneity

Used to describe the scene in musicals where people in the street know the words and tune to the song sung by any main character, and instantly know the dance routines including, but not limited to: jumping over barrels, swinging girls in the hair and juggling. This is all despite being total strangers.

This is all supposed to be spontaneous, of course, but naturally - it's actually choreographed

"Oliver! really made me laugh. What did you think of all the choreographed spontaneity?"

Choreographed spontaneity by Antihero May 1, 2005

spontaneous 

Taking a risk, living life to the fullest, no plans, "don't think just do". To be spontaneous is to be the most relaxed go with the flow and have fun person, you would never get mad if plans changed you would get excited because than it would become spontaneous.

"Hey what do you guys wanna do tonight?"-dana
"We had those plans to go see the 11 o'clock move"-Celeste
"Why don't we get in the car and just drive and see where we end up going or what we think of."-cassidy
"Let's go it will be a spontaneous adventure,forget the movies."-dana

spontaneous by lily123456 February 15, 2012

Preventing Spontaneous Human Combustion

To let one rip
First coined on the hit show:south park

ex:

Man:Dude that was sick it smells like eggs...
Dude:Hey man just preventing spontaneous human combustion here...

Preventing Spontaneous Human Combustion by Fucktarded Scarecrow August 1, 2009

Spontaneous Mouth Birth 

Spontaneous Mouth Birth (SMB)

Drinking/Eating something so fully and completely vile that it will cause pregnant women to immediately vomit the child through the mouth, giving birth orally.

Often times the side effect of drinking a friend's specially crafted "micro-brew style beer" Like a mulberry beer.

Essentially, vomiting horribly...

My wife took a sip of your micro brew and had spontaneous mouth birth . It was THAT BAD!

Spontaneous Mouth Birth by Decrata September 3, 2013

Spontaneism

To go on an adventure without a plan or idea of where you are going or what you'll do next. Basically spontaneity but much cooler.

Every good adventure has a bit of spontaneism.

Spontaneism by emsfanpage January 6, 2021

Spontaneous Orgasm

When somebody (male or female) suddenly becomes very happy and begins to shake and make incoherent sexual noises.

Bob: look at that freak over there, what the hell is he doing?

Fred: Dude, he's having a spontaneous orgasm

Spontaneous Orgasm by George Danforth March 31, 2008