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1.
The point where you've eaten so much food that you want to vomit, but can't.
"Holy shit man! You ate two entire pizzas!"

"I know man, but now I'm stuck in purgeatory.."
by Exuro11 May 22, 2013
 
2.
A transcendent feeling of nausea or major GI distress occurring during an intense exercise session. Many times it is related to poor dietary choices made prior to exercise.
That cheeseburger I ate last night put me in major purge-atory during my 5 mile run this morning.
by sadist4hire September 09, 2011