Everyone has a shitty day once in a while. Fireass is when your ass gets irritated by sweat activating the fecal matter left behind from a sub par wipe after shitting.
More common on hot summer days, fireass takes several hours to develope, and has different levels depending on the intensity of discomfort experienced.
" Oh man, I took a shit this morning, and I've been sweating like a pig... this FIREASS is killing me. I got level three FIREASS. I'm gonna go sit in a snowbank. "
by Marc O-C January 23, 2006
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A condition when excreting feces (taking a dump), your anus literally feels hot as a result of eating too much spicy food.
Where is your bathroom?, I think I'm going to have some serious fireass after going to that all you can Indian buffet
by Dandar October 26, 2005
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Fireass is also known in the UK as Chef's Arse, the result of working in hot sweaty kitchens
When I was working at the hotel I dreaded working in the kitchen then having to cycle home with a bad case of fireass or Chef's Arse. (Arse is the UK equivalent of Ass).
by Crispy Brown December 2, 2006
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a red headed person, whom logically has red hair on their ass as well.
Look at that fireass over there. Scorching everything he sits on.
by jeff March 6, 2005
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"amazing" or "really good"

Used to describe a desired subject; often a compliment.

Usually used in a sentence before the actual subject.
That's some fireass pizza!

I was going to go eat with you guys, but my mom made some of her fireass lasagna, so I'll pass.
by ~JM December 2, 2008
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an interjection used when a really shitty driver attempts to become some sort of speed demon/ kamikaze dude and almost kills everyone on the road. short for the phrase "wheres the FIRE ASShole?"
Kari: HEY!!! becareful Chrissy...that guy is going to kill us!!! Hes driving like a crazy person!
(as the guy speeds by, windows down, screaming)
Chrissy: FIREASS!!!!
by Chrissy/Kari February 25, 2003
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