The toilet in the 1970's space station "Skylab" had a suction fan and a safety belt to strap yourself down with in zero gravity.

Zero gravity would cause the faeces to float all over the place disasterously so there was airflow to suck the faeces into a bag, a bit like a vacuum cleaner does. Now, if the bag broke somehow, then the "Shit hit the fan!!".
Awww no! the bag burst and the shit hit the fan!!!.
by Marcus Rosenblat January 07, 2007
When something goes TERRIBLY wrong.
After I opened the door to the Portal to the other dimension - about five or six two headed, green dog-like animals jumped out of it and started devouring everything. In other words - shit hit the fan.
by Gvazdas April 24, 2010
The shit is information, and the fan a person or persons (often an employer or partner or someone in a position of seniority or superiority) to whom the information will be viewed as very bad news and also who is/are going to react immoderately and with no concern (or even some delight) as to whom the information then spreads.

This is an analogy for the worst possible development where concealment or deception have taken place and is a story in three parts: 1)The shit and the fan are seen as separate giving rise to nervousness of the awful consequences should they meet. 2)That moment arises, when time appears to stand still and the blades of the fan appear frozen for a split second. 3)There is an awful smell and a heck of a lot of clearing up to do.
The shit hit the fan when my mother returned home early to find my father trying on her best summer dress in front of the mirror.
by Paul Newton June 29, 2006
When a situation goes from bad to worse. Could be just about any situation work related, family related or significant other and so on.
When we were running late for our friends wedding because of me i was in trouble but it wasnt til we made it there that the sh_t hit the fan, the wedding was the previous day.
by Dave April 06, 2004
The escalating of a situation to extreme boling point. The ensuing spillover and chaos from doing something that will piss someone else off.
"The shit hit the fan after sum good sex, when I told her that I'd 'had better' the night before."
by gang fuck September 01, 2003
The throwing of excrement over rival football supporters.
Tom: Liverpool are playing Man United at Old Trafford this week-end.
Bill: I'm sure we'll see the shit hit the fan at that game!
by Dung a Din October 17, 2006
when a bad secret is let out and everybody knows about it to disastrous consequences. imagine the smell and splatter if someone blasted hershey-squirts into a rotary fan.
my favorite scene in the movie airplane is when the shit hits the fan. to bad its cut out in the "edited for television version"
by minghi May 10, 2003

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