The process by which, through the ingestion of an unruly quantity of phosphorous, one's ejaculate spontaneously erupts into flames upon expulsion from the penis causing widespread fear and panic.
Dave and Marie were dating until Dave's spontaneous cumbustion all over Marie resulting in a sudden case of the funerals.
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(n.) diahrrea, often of the explosive and unpredictable sort.
What Donald thought was a fart had turned out to be a bout of spontaneous regularity.
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Used to describe the scene in musicals where people in the street know the words and tune to the song sung by any main character, and instantly know the dance routines including, but not limited to: jumping over barrels, swinging girls in the hair and juggling. This is all despite being total strangers.
This is all supposed to be spontaneous, of course, but naturally - it's actually choreographed
"Oliver! really made me laugh. What did you think of all the choreographed spontaneity?"
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When somebody (male or female) suddenly becomes very happy and begins to shake and make incoherent sexual noises.
Bob: look at that freak over there, what the hell is he doing?
Fred: Dude, he's having a spontaneous orgasm
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An uncontrollable reaction to a particular event or stimulus where there is a total loss of most brain action.
1. As Bob and Joe were walking by the park, they had a sudden urge to play on the jungle gym due to spontaneous retardation.
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."
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