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1.
When the act of taking a shit is accompanied sensation of your rectum being on fire.
Exclusively used for the morning after drinking cheap beer.
After drinking an underteminable amount of PBR, I had the worst fire shit.
by woody April 30, 2003
 
2.
origin:
unknown

Etymology:
Middle English, from Old English fyr; akin to Old High German fiur fire, Greek pyr
and
Middle English, from Old English scite; akin to Old English -scItan to defecate

Function: noun

1) painful anal excretion of human waste that is associated with a burning feeling in and around the asshole.
"I got the fire shits from all that beer I drank last night!"

"...no thanks, too much coffee gives me the fire shits."
by SumDumGuy September 03, 2004
 
3.
after you eat some jalapenos you get the fire shits which is usually a greenish painful shit.
Man that italian bmt was loaded with jalapenos. I had the fire shits and couldnt sit for a minute
by NIggalicious February 14, 2007