The act of instant male orgasm upon seeing something insanely hott.
When Lauren and Silvia took their clothes off, Patrick experienced spontaneous cumbustion.
by Sivv Vicious March 24, 2008
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Jill was pissed Randy was premature last night. Jill said he suffers from Spontaneous Cumbustion.
by PSpin420 November 2, 2009
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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.
by Walrusboy December 11, 2005
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Spontaneous Euphoria is the phenomenon when you're doing a seemingly normal routine, and all of a sudden you get hit by a random wave of extreme happiness. Studies show that the chance of spontaneous euphoria may increase greatly while doing something positively nostalgic.
*Your friend suddenly stops walking*

You: Hey, man, what's wrong?

Friend: *shakes his head* Oh, nothing, I just got a wave of spontaneous euphoria
by Icohedric January 20, 2014
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What happens when a man is lured into a hookup with Bob Seger's Night Moves, and thusly has an erection only to be surprised when the song is changed, midway, to any Don Henley Song. Instant loss of erection.
I was at that chicks house working on our night moves until Don Henley came on, it was spontaneous flaccidity.
by The D Abides February 23, 2010
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meeting another person at any location unexpectedly, then hanging out with them for a period of time.
Running into a friend at Noodles and chatting with them for a while. This is a spontaneous date
by Joey Dogggg March 16, 2010
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The act of two males performing a donkey punch and white dragon in unison on a female during an mmf.
"We gave Dorothy a spontaneous cumbustion last night. Her head exploded and a geyser of blood and cum splattered the walls."
by Gide October 2, 2006
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