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1.
1) To find oneself in a public toilet that is lacking a door lock, a toilet seat or a loo roll

2) Any situation in which poo becomes a visible nuisance
1) "Aww man. there's no toilet paper up in this smelly joint. What a shitemare."

"I've got paper for you buddy, in return for a little something something that is."

"Ted? Is that you?"

"It was always me Bill, it was always me."

2) The Indian Commonwealth Games
by H.S. Willsy August 19, 2011
 
2.
One step up from a nightmare, bad news, or an annoying person!
"Dude, that girl is an absolute shitemare!"

"The party was a complete shitemare!"
by Define April 09, 2007