Incident in which you take a dump, and the toilet splashes you back in perineum. This is different from a regular bidet in that it's the toilet water that's splashing you, not a directed tap.
As a rule, this nearly never happens at home, and it frequently happens when you're forced to use a stall with overtly nasty waters or after you've already urinated.
person one: I'm a little worried. I had to use the portajohn at the airshow, and it gave me a spontaneous bidet.

Friend: Dude, you need to see your doctor.
by johnboynurse March 4, 2009
Get the spontaneous bidet mug.
When you have a big juicy Five Guys cheeseburger and 45 minutes later you shit yourself in the most embarrassing situation. This usually happens when the burger is made with jalapeños and hot sauce.
Last night I was hanging with Carol, and just about as I was ready to stick it in, I had a spontaneous shitting. It was all over he place. She laughed.
by Fnseriousdude April 20, 2010
Get the Spontaneous shitting mug.
Oral sex that is not requested, expected or prepared for. Common traits of the receiving parnter usually include shock and awe followed by extreme happiness.
Brendan was only on a second date with this girl, but when she came with the strong spontaneous head after dinner, he fell in love.
by Zack, Spontaneous Head Fan January 2, 2010
Get the spontaneous head mug.
When one's teeth turn to liquid and then drip down the back of one's throat.
"The Office" - Health Care (2005)
Jim Halpert: Wait, what are you writing? Don't write ebola or mad cow disease, all right? Because I'm suffering from both of them.
Pam Beesly: I'm inventing new diseases.
Jim Halpert: Oh, great.
Pam Beesly: So, like, let's say that my teeth turn to liquid and then they drip down the back of my throat. What would you call that?
Jim Halpert: I thought you said you were inventing new diseases? That's spontaneous dentohydroplosion.
Pam Beesly: Nice.
by Zak Kim January 18, 2007
Get the spontaneous dentohydroplosion mug.
To suddenly and without warning grow a vagina. See also, depenisification.
"Hey, wasn't Chris supposed to show up tonight? Where is he?"
"I don't think he's going to show, looks like another case of spontaneous vagination."
by crunchyk9 May 12, 2008
Get the spontaneous vagination mug.
The boner you get for no reason at all, usually happens during non-arousing times, such as english class or a funeral.
dang did you see how jim was walking? I think he was hiding a spontaneous erection.
by ricky warden June 6, 2006
Get the spontaneous erection mug.
The use of iPhone Emojicons spontaneously through a text message. Generally a lengthy message, and could result in a "Spontaneous Emojicon War" through text between two or more people however a winner always emerges as it takes time to type each message and generally one person will quit and find something better to do.
Wow, you have a lot of emotion all of the sudden! Spontaneous Emojiconing that is!!!!!
by friendlesscoolkids December 7, 2010
Get the Spontaneous Emojiconing mug.