Definition:
When a sheep is on its back and cannot turn over it is said to be riggwelted, or rigged. A person who cannot get up may also say that they are riggwelted or rigged.
Usage:
"I can't get up, I'm riggwelted." "That sheep's rigged."
Explanation:
From the Old Norse "rygg" meaning shoulder and "velte" meaning to overturn.
Trivia:
Black Sheep Brewery in Masham, North Yorkshire makes a beer called Riggwelter. Whether it knocks you over and you can't get up after drinking it I've not experienced.
