Is a phrase that has become popular after somebody posted on MLIA (mylifeisaverage.com) about translating the phrase "Liar, Liar, Pants on Fire!" to French and back again, and coming up with "Teller of untruths, your trousers have combusted"
by Somebody_Else October 26, 2009
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One of the coolest things to say when you and your friends are bored to hell and they don't expect it.
Dude 1: Man! flaming anus spontaniously combusting and bursting into flames as he jumped off the cliff!
Dude 2: Cool!
Dude 3: Awesome!
by Yargengee October 18, 2006
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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*
by RealWhiteHoodGangster134 May 11, 2025
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Caketual Combustion

The effect of eating to much cake

ussually occurs after hiccuping, than KABOOM caktual combustion
OMFG, that was alot of cake, omggg im going to combustionally combust on cake!!!! "death by caketual combustion"
by Sara Kessler August 17, 2009
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Constipanious Combustion

When you hold your poop in so long that you die, upon death your colon explodes much like an explosion of watermelon with a quarter stick of dynamite.
I would ask how she died inspector, but I can see by the color of the walls that it was Constipanious Combustion again. That's the third one this week.
by ADANKFART March 27, 2022
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instinaneous combustion

something that suddenly enflames largely.
me:WOAH! my pants just went into instinaneous combustion!
you: niceeee mannn :
by -xoxo Deeeena love December 14, 2009
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external-combustion engine

A fluid-fuel-powered motor that is so poorly designed/maintained that its exterior actually catches fire.
One should periodically check "under the hood" for oil-leaks to reduce the chance of said power-plant's becoming an external-combustion engine.
by QuacksO October 03, 2019
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