"When the shit hits the fan" is the vulgar and more satisfying term for a situation that suddenly gets messy. It gives you an idea of just how messy a situation by comparing it to being in a small room when a handful of loose feces are launched into the spinning fan blades.
1: When that silly old bitch pranged John's prized Mercedes in the parking lot and then tried to take off, shit really hit the fan. I though he was gonna kill her.

2: Where's our fucking money?! You better have it, or the shit is gonna hit the fan, believe you me!!

3: I lost everything back in 2008 when the shit hit the fan. Just like a lot of people.
by WHISKEYMAN1234 February 26, 2020
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A way to describe how bad things are or will be and the effects will be widespread. Yes, when shit hits the fan its bad and only get on you, but when it hits the ceiling fan it's getting on everyone and everything.
Did you do your part of the homework?
No, dude! Shit hit the ceiling fan and now everything is mess up!
by INCYCShow March 11, 2022
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