When a secret is let out with potentially devastating consequences. If some faeces were to come into contact with a fan it would splatter them everywhere, devastating.
"I told this guy at my school how his girlfriend was a good lay, then the shit hit the fan."
by Soiled Undergarment August 18, 2003
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when something is about to go terribly wrong. What all the people on "Doomsday Preppers" say.
I made myself a bunker and have lots of food and guns stored in there, because we all know when shit hits the fan people is gonna wish they was me!!
by lafunDUH November 24, 2014
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When something you've been trying to cover up goes public.
The shit's hit the fan! They found the bug in the DA's office!
by Moore August 1, 2004
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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 8, 2007
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Eminem: So what you gonna do when shit hits the fan, are you gonna stand and fight like a man, will you be as hard as you say you are, or your gonna run and ditch your body guard.
by Levon5100 February 2, 2004
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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
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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
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