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Combustion 

The act of a material or substance breaking or falling apart.
When we pressed the launch button, our rocket just suddenly combusted. Six months for just one big combustion.
Combustion by XxJake474xX May 18, 2008

combustion 

When something goes off with a bang or an event was heavy
Yo, dat dance was combustion
combustion by guardian October 24, 2003

Combustion Engine Sex 

Combustion Engine Sex is when you have anal sex with someone who has a poopy butt

So basically you ram your combustion cylinder into their valves and poop splatters all over your dick and on the floor and walls
Dave: hello mike dont wipe i wanna have some mad combustion engine sex
Mike: hell yeah lets get it
*mike goes to bed with poopy butt*
Dave: OHHH IM BOUTTA COMBUST
*coems*
*poop explodes everywhere*

Shitaneous Combustion 

After eating lunch at the taco truck down the street, I had shitaneous combustion when I got back to work.
Shitaneous Combustion by Htos_Drol November 27, 2012

Preventing Spontaneous Human Combustion

To let one rip
First coined on the hit show:south park
ex:

Man:Dude that was sick it smells like eggs...
Dude:Hey man just preventing spontaneous human combustion here...

Anal Combustion

Any form of explosion just inside the anus. Could be the result of inserting and igniting gasoline or gunpowder, attempting to light a fart, or that Mexican food from yesterday. Depending on the strength of the sphincter, severe anal combustion may result in blowing out the anal socket or rupturing of the rectum.
I had pretty bad anal combustion after that spicy 15 bean soup--it almost blew out my sphincter!
Anal Combustion by b007y514y3r March 11, 2016
More from Urban Dictionary
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026
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