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.
by Rajib May 17, 2005
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An explosion of jizz in your pants. Literally!
That chicks so fine cumbustion was unavoidable!
Dude, go change!
by CWeed, Browniemixx, Echo January 11, 2009
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ejaculating much faster than you had expected.
That chick was so good at head, I was cumbusting in her mouth without any warning!
by owner of a psychotic dog October 17, 2014
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The ability for me to cum on your mother's bust.
Dude, my cumbustability was at an alltime high yesterday.
by EBRJ July 7, 2010
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To have performed sexually at such a profound level that the utilised orifice has caught fire due to friction.

This could be down to a number of factors:
1. Overly fricative appendage surfaces, e.g. a scaley penis
2. Use of a lube with an insufficient smoke point for the activity, e.g. high-velocity anal sex lubricated with Butter (176°C) rather than Ghee (250°C) that meets an emulsifier, e.g. 'Baby Gravy', thus overcoming a natural fire retardant, e.g. 'Fannybatter'

Example 1 is pure friction but usually occurs before Cum enters the picture so is not relevant to this analysis
Example 2 is the true Cumbust in that it is down to the complex chemical interations of these substances when extreme kinetic energy is applied to them
Bob - Jesus, did you see what happened when Bill banged Brenda's Bum hole?

Babs - Nope, wtf?
Bob - She Cumbusted, flew into low earth orbit, left a trail of winnets in the night sky that looked like a meteor shower
Babs - Shit, talk about blasted into maternity by a guided muscle....
by Sick Man Fraud December 16, 2022
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1. Term referring to a male who busts cum, i.e. likes to suck dix
2. Gay person
3. Often used as a general insult.
1. Dude, Steven likes to pants people. What a cumbuster.
2. See that guy in the plaid jacket? He's a cumbuster.
3. DON'T TK ME YOU FUCKING CUMBUSTER.
by Grif April 9, 2004
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When you get so excited that you ejaculate without notice.
Keep ordering me oyster shooters and I might just cumbust.
by RJ3000_ August 16, 2019
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