Cumbutton 

After having sexual relations with a man when he cums on his partner's stomach and most of it gathers inside the partner's bellybutton.

"Jane, what's that in your bellybutton?"
"Oh phooey, that's from last night when Todd gave me a cumbutton."

Cumbutton by Evan Vanderhoff November 11, 2016

Cumbustion 

An explosion of jizz in your pants. Literally!

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

Cumbustion by CWeed, Browniemixx, Echo January 11, 2009

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.

Spontaneous Cumbustion by Diction.net February 24, 2015

cumbusting 

ejaculating much faster than you had expected.

That chick was so good at head, I was cumbusting in her mouth without any warning!

cumbusting by owner of a psychotic dog October 17, 2014

cumbuttable

when two gay guys were made for one an other.

look at those too guys we should hook them up....they are so cumbuttable....

cumbuttable by magh8 August 25, 2010

Cumbutt 

Cumbutt is the sticky side effect of the male penis being removed rapidly post ejaculation. If the penis is promptly removed after male ejaculation, and is unprotected, semen will naturally run down from the vagina towards the anus;thus causing so called "Cumbutt".

Male and female in missionary position. Impatient male pulls out, and after ejaculation has his freshly ejaculated semen begin flowing into the females butt cheeks. Female responds "babe, you gave me Cumbutt"

Female-"Sweetheart my ass cheeks are sticky now!"
Male-"Ha, you got cumbutt."

Cumbutt by Wierdfeet987654321 August 12, 2011

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