A Shitver
when your guts are so full of poop that your body starts shaking like a dog with a bone and you're one second away from a full-blown poop explosion
My Shitver was so bad, I had to hold on to the toilet for support.
I had a Shitver so strong, my pants got soaked.
I was about to explode and my Shitver reminded me I was still human.