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 3, 2019
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a verb to describe that you get all bothered due to sexual tension in someone's proximity or their actions
"He looked at me right in the eye and I thought I would combust."
by blackberry_n_bay October 2, 2022
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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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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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