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.

ass furnace by Freeze040506 February 8, 2009

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 by PR Gal 60010 February 17, 2009

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.

furnace ass by EvilRedhead October 9, 2014