When a smell/odor is so painfully foul, that it excedes the capacity of the word: rank, makes all the tiny hairs of a person's body stand on end, and ultimately leads a person to believe that the origin of the smell/odor is definitely septic and putrid.. it is septicputridicity.
When half an airplane is not able to breath and starts to make unconscious statements/grunts/sounds outloud due to a certain individual because of the lack of oxygen.. one passenger might consciously say "Dude! That's Septicputridicty!?!"
by Dara Lugay, Arvin Lugay March 1, 2007