when you pick up poo and lob it in a fan and it sprays everywhere -
On xbox live:
Marc: OMG shits hitting the fan!
Steve: Oh no it must be spraying everywhere!
by Baldykaine January 24, 2012
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1.)When all hell breaks loose, Pandora's Box is opened, when you're screwed big time, and/or when yer fucked over.

2.)The moment at which fecal matter hits the spinning blades of an electric fan.

3.)A really good Circle Jerks song featured on the cult classic film Repo Man.
We just get by however we can. We all gotta duck, when the shit hits the fan!

Goddamit boy, how many time have I told you to stop shitting in front of the fan?
by Holy Dragon Sword May 15, 2004
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Term used in Halo 3, when someone is getting pretty pissed off and about to beat some serious ass and throw around some insults.
"Ya, shit hit the fan pretty early in the game, and i owned some serious ass last night."
by Darkrage November 28, 2007
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A saying used when information is just discovered that will completely change everything.
Dude, did you hear that Jane slept with Declan?

Are you kidding me? Shit's about to hit the fan!
by erin348 July 23, 2010
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Sometimes it's advantageous to ignore the problem, let it explode, and have other people deal with it. This policy is called "let the shit hit the fan".
A: Look, these numbers they gave us are really wrong.
B: I say, let the shit hit the fan and then they'll fix it.
by UrbanCulture July 11, 2006
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When something really bad is about to go down. The brief moment before a world of pain is brought down upon someone
When someone says Kelly has small eyes but doesn't realise she can hear them. That's when the shit hits the fan.
by didntsaykellyhassmalleyes August 17, 2010
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