shit blizzard
A somewhat rare and ghastly occurance where the forces of nature collide at high pressure, collaborating a chain reaction of shit.

also:
A series of bad things that happen in a very rapid, sometimes simultaneous, manner.
Jim Lahey: Feel that?
Randy: Feel what, Mr. Lahey?
Jim Lahey: The way the shit clings to the air, Randy...
Randy: Shit clings to the air?
Jim Lahey: It's already started, my dear good friend.
Randy: What's started, Mr Lahey?
Jim Lahey: The shit blizzard