the chimney effect

The Chimney Effect appears most often when you fart wearing insulated clothing like ski jackets\pants, which causes you fart to travel up you pants\jacket and then explode in your face. And in some cases it will follow you around for a while.

Guy 1 : Damn man I just had the nastiest fart.
Guy 2 : You better open your jacket or that fart is going to explode in you face.
Guy 1 : Oh shit I completely forgot about the chimney effect