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1.
What you say when you know something big and bad is happening.
Dude, did you hear about Jamie cheating on Zach?
Yeah, shit is going down!
by JesseTheJohnson June 13, 2008
 
2.
Moment in time shortly preceding defacation.
"Dude, you've been in there for the past hour. I need the toilet too, come out!"
"Sorry I can't, shit is going down!"
James Bond - Quantum of Solace

"My brow frowned
In strain
As the poo train
Came to town
Shit was going down"
Seamus Heaney - Childhood Memories
by Holden_Caulfield__ May 27, 2013