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5.
the action of sitting and shitting combined
as you sit down on the toilet you are also in the process of pooping

alternatives:
past tense- Shat down
present tense- shitting down
Mary had the runs all day so she ran to the bathroom and proceded to shit down.

Dude that Waffle house ran right through me last night...I totally shat down on the toilet.
by tkbomb9000 April 04, 2009
 
1.
taking a cheeky break during a long day at work by having five or ten minutes sat on the throne doing nothing..
or possibly a one minute power pooh followed by nine minutes of just sitting and relaxing..
Roger: I'm knackered man.. been on my feet for two hours now.
Bill: nip for a shit down mate, you've deserved it.
Roger: yeah, good call. back in ten.
by long jon donger December 18, 2010
 
2.
shitdown shit-douhn
- noun

Virtually known as a piece of shit electronic's last dying beep. Any device could be symptomatic if it is beyond all fucking repair.

shit down
- transitive verb

To experience utter farking failure in an electronic apparatus.
Noun:
Omgawd my computer totally just experienced a massive shitdown, fuck a bitch!

Verb:
My piece of shit Mitsubishi just shit down in a Hooters parking lot. If it had done so next to a Taco Cabana, all of the parts would've been stolen and I wouldn't have had to pay to have it towed to a fucking junkyard!
by dgills June 01, 2010
 
3.
to take a poop, have a movement, drop a loaf.
"Damn, I've got to shit-down."
by Nasty Nate, LBK March 17, 2009
 
4.
When a person takes a dump, accidental or otherwise, the literal second their ass touches the toilet seat. Often associated with sudden/panic Diarrhoea, Irritable Bowel Syndrome, or just plain misfortune.
One:

"Thank fuck! Shitdown! A second later an' I woulda fudged my drawers fo' sho' "

Two:

A: "Why you all flustered dude?"
B: "Yo man just had a shitdown, coulda been some serious shardage"
A:"Thank the Lord"
by Josh B04 March 08, 2008
 
6.
An unexpected termination of software or hardware.
- "Did you shut down the server?"
- "No dude, it was a shit down again. We gotta get that fixed"
by Richard Dallaway August 19, 2007