ass furnace
When one has severe constipation then goes to taco bell and eats a fiery hot double decker taco thus resulting in the build up a steaming hot turd inside your rectal cavity.
I shouldn't of eatin that taco bell today since im constipated, now i have a steamy ass furnace and might shart my britches like a british bitch.
Furnace Ass
The extreme discomfort/cramping/sweating associated with the overindulgence of too many hot wings (or other spicy food), too much cheap beer, or a combination of them both.
John missed football practice because his furnace ass kept him in the bathroom all afternoon.
furnace ass
A romantic partner who gives off a lot of body heat.
Wintertime camping is easy and comfortable when you share a sleeping bag with a furnace ass.