spontenasity 

some one who is really spontanious. is always doing something on the spur of the moment.

gregg is filled with spontenasity

spontenasity by Emily June 14, 2004

Spontananity 

Random and unexpected moments of insanity.

Dude1: BANANAS!!!!

Dude2: Uhhhmm...what?
Dude1: Sorry. Hit a bit of spontananity there...

Spontananity by Izzyjaimz June 22, 2009

Spontenudity 

The sudden impulse to become nude; the urge to become either partially or completey naked

I mooned my entire class! It was a great moment of spontenudity!

Spontenudity by Optimist Prime June 3, 2007