Spontaneousity 

The act of being spontaneous, especially in times where the spontaneous act surprises others.

The spontaneousity of Jess screaming during a time of dead silence.

Spontaneousity by Silverose January 13, 2009

spontaneously 

Doing something unplanned or unrehearsed

My wife has spontaneously cooked dinner

spontaneously by Smartgirl100 April 6, 2016

Kelly spontaneously showed up 

To be aroused sexually; to get a boner without expecting

Kelly spontaneously showed up when Jeris was on a road trip to Wyoming with the guys.

Kelly spontaneously showed up by CougarCrazies August 2, 2008

spontaneosity 

A character trait that concentrates on keying in on a certain idea and throwing in a random amplifier, making better of any situation.

He was on the edge of reblossoming a relationship; all he needed was a little spontaneosity.
The spontaneosity of Football is what entices the crowd.

spontaneosity by Makki Nelson July 26, 2008

Spontaneously Romantic Relationship 

With a romantic relationship, you get to know your partner a lot more intimately and it shows a sweet side too. Through the romantics, i think your partner would feel a lot more of the love and definitely more heartwarming.

With a spontaneous relationship, you keep each other active. And sure keeps things fresh. Exciting for sure.

Put them together and you have a relationship that is both full of love and full of excitement too. Keeps the relationship alive. You openly show affection towards each other no matter what anyone says and aren't afraid to express your feelings in a wild, over-the-top manner.

GIRL: "I have a spontaneously romantic relationship with my boyfriend, neither of us are afraid to express how we feel in the most dramatic way possible. It never gets boring with us."

BOY: "I'm always so spontaneously romantic with my girlfriend, she loves the crazy things i do to show i care, and vice versa."

Spontaneously Romantic Relationship by TimTamalicious January 4, 2011

Spontaneously self-combusted 

Usually said after relaying a chain of events to make them sound more interesting.

"Then I went to the computer and logged onto Facebook, and I suddenly spontaneously self-combusted."

Spontaneously self-combusted by ArticunoJynxNidorinaBeedril May 23, 2010

Spontaneousism 

The act of doing things without too much thought just for the thrill. Usually ends up being an adventure.

Andy took Danny out on a surprise date. Danny found his Spontaneousism flattering .

Spontaneousism by Bruja June 13, 2018