MaryAnnSingleton, my dad once did a very similar thing.
We had arrived at a rented holiday home in France late at night, and just piled into bed.
In the morning, my dad went to the bathroom downstairs for his 'morning constitutional'. When he came to flush, nothing happened. He jiggled the lever a bit, lifted up the lid, no water.
Then he noticed that the loo wasn't even plumbed in at the back!
In the end he carried the whole loo outside, to the end of the garden and tried tipping it out. No luck, cos it just got stuck on the rim.
Eventually he had to extract his poo with the aid of sticks and leaves!
This story has entered the family annals as one of the funniest things ever to have happened on holiday.
To OP, get an old knife or spoon, put the marigolds on, hold your nose and don't look, just stab and saw. Good luck