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To ejaculate or blow your load rapidly. Used in the porn industry to describe when a guy sprays his cum all over the female actress' face.
How bout I cumbust all over ur face.
cumbust by Rajib May 18, 2005

Cumbustion 

That chicks so fine cumbustion was unavoidable!
Dude, go change!

cumbustrophy 

If someone aggressively cumbusts all over the place.
After the cumbustrophy, the cum was everywhere.
cumbustrophy by Tepovation March 19, 2022
Girl/woman who gets fucked on an extreme frequent base, cum from the previous ejaculation will still be dripping out of her cunt when the next dong arrives.
Rodney: Geez man, I had a great fuck with Erica last night
Carl: Ow shit, your screwed that cumbitch as well? So it was your load which made me ride so smooth!
Cumbitch by DrLame July 24, 2006

cumsistency 

A word to describe a fluid that has a semen-like thickness.
That protein shake you made sure does has a certain cumsistency.

Spontaneous Cumbustion 

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.