After you have eaten something spicy and you go to poo hours later. Your butt-hole burns from the hot spice, it is on fire, firehole.
After I ate my abuela's spicy chicken I had major Firehole!
When the significant other knowingly eats spicy food. Takes a dump and proceeds to have anal sex with their partner burning the penis.
My boyfriend loves anal sex. I think I'll eat Jalapeno's and Carolina Reapers for a spicy firehole tonight.
When you just had Mexican night last night, and the next morning you gotta take a shit in a cold outhouse for whatever reason, causing a cold, spicy shit fiesta.
“Dude how was your camping trip?”
“It was ok, but the shitty part was Wednesday morning, I had to go through an Alaskan firehole.”
“Ohhhhh that sucks”