The smell that accompanies a bowel movement that has a tendancy to fill the air with a rather pungent odour that would resemble a thick fog should you be able to see it instead of just smelling and tasting it. Usually accompanied with either joy or disgust depending on it being your own personal poo fog or not. Sometimes known as a shit cloud or turd mist.
As Jimmy sat down on the still warm seat he couldn't help but choke on the particularly thick poo fog as he pondered whether the previous occupant had enjoyed a vindaloo and 10 pints the night before.
by Martin Lynch January 17, 2008