One who enjoys smelling farts, either self-flatulated or those originated from another man or animal. Fart huffing typically involves a series of deep and aggressive inhalation cycles, sometimes aided by a cupping motion of the palm, fanning the fart from the asshole to the nose.
I was amazed to see Jimmy huffing his dog's silent farts. He huffed as if posessed, and it made me sick to my stomach. I guess Jimmy is a real fart huffer.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.