Spontaneous Erection Disorder 

a problem usually found in young, male(obviously) teenagers when even though they may not be aroused, they may obtain an erection.

A: dude Steve had a boner in english today. it was nasty

B: dude thats not funny, Steve has Spontaneous Erection Disorder

A: don't wel all?

Spontaneous Erection Disorder by kl2895 January 10, 2011

Spontaneous Giggity 

When using a chat app such as Grindr, this happens when a conversation suddenly has sexual overtones about as overt as a quick brick to the gonads.

"So you like cake too eh?"

"Me too. I'd like to see your nude lady parts surrounded by cake."

"Sorry for the spontaneous giggity. I haven't had sex in months."

Spontaneous Giggity by Lhro4ever March 20, 2014

spontaneous lactation 

When a women suddenly squirts milk out of her breast due to extreme surprise or pleasure.

Girl: why is there milk on the floor?
Girl 2: Spontaneous Lactation

spontaneous lactation by Fender315 March 4, 2015

Spontaneous Cumbustion 

The act of instant male orgasm upon seeing something insanely hott.

When Lauren and Silvia took their clothes off, Patrick experienced spontaneous cumbustion.

Spontaneous Cumbustion by Sivv Vicious March 23, 2008

Spontaneous Cumbustion 

An unexpected ejaculation

Jill was pissed Randy was premature last night. Jill said he suffers from Spontaneous Cumbustion.

Spontaneous Cumbustion by PSpin420 November 2, 2009

spontaneous human combustion 

to suddenly, and with no apparent reason, burst into flames and within minutes become a human cinder. a.k.a. SHC

defoe was running so fast towards the opponents penalty area that he suddenly suffered an acute spontaneous human combustion

spontaneous human combustion by theWestHamfan November 4, 2003

Spontaneous Love

When one day you aren't in the least bit attracted to them, and the next, it seems like you can't live without them. So you screw over all your other friends to be with, look at, and hit on her. Your friends will probably not like the part where they all get screwed over.

I went on a band trip with some friends, and Danielle was there. At first, i didn't think anything about her, i didn't even like her. Usually, i was sort of unkind to her and didn't pay her much attention, but when i looked at her later that day, i noticed for the first time how truly beautiful she is, both physically and mentally (hence the term, spontaneous love. so i blew off my friends for the rest of the weekend just so i could get to know her better. She is the Most amazing person i have ever met in my entire life. the feelings i have when i am with her are the best i have ever felt. not like i wanted to f*** her or anything, but just that i wanted to hold her and spend time with her.

Spontaneous Love by Walrusboy December 12, 2005