Basically, this is when emotions break loose and people get hurt. A literal meaning would be that shit gets on everybody due to the intrinsic nature of the fan.
Expression - A derivative of the original: "The excrement made physical contact with a hydro-electric powered oscillating air current distribution device". Used primarily to describe a set of circumstances where events became inflamed to a point that control was lost.
A term used when a situation goes from bad to worse. (When there is shit that stinks...thas bad. When shit hits a running fan, flings it all over the place, and spreads the wafting stank...thas WORSE!).