The burning sensation one feels in their rectum after having been flatulent the entire day.
Navin: Oh man, I had Taco Bell all day yesterday, and now I have fartburn.
by avaron November 02, 2006
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when you poop or fart and you butt hole burns. not like tempature, but like hot sauce on your tounge, or when you throw up and it goes up your nose. like that exept on your butthole.
guy 2: EWW that was a wet one! wasnt it?!
guy 2: what?
guy 1: it feels like i just farted out jalapinos!
guy 2: omg...
by Bubba2x4 February 15, 2009
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The hit/warm sensation one gets when expelling some, but not all, farts.
Timmy: “Mommy? When I tooted it felt real hot coming out my bottom.”
Mommy: “You have fart-burn Dear. Enjoy it while it lasts, but do so down-wind.”
Timmy: “Yes’m...”
by Chili2 July 23, 2018
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The fecal residue left in one's underpants resulting from overindulgence of food and/or drink.
"Man, I ate me some good ole beans and it gave me the worst fartburn! My wife had to bleach my underwear twice just to get the stains out."
by XtremeJokes August 13, 2008
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A heartburn variant, Having horrid, musty, hot farts and a tremendous heartburn simultaneously.
"Man, I was up all fucking night with horrible fartburn, I was painfully passing butt fumes, whilst having horrible hiatial hernia hairy heartburn"
by Opie78 June 03, 2018
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