1) Done; Finished; Complete.
2) Wasted; Intoxicated, from drugs and/or alcohol, to the point at which no more partying shall take place for the evening/morning.
3) To be in over one's head; To be in a great deal of trouble, screwed.
1) Q: "Hey, man, you have any more exams this week?"
A: "Hell no, man, I'm donions."
2) "Wow, look at that kid passed out on the couch. He's donions...Hey hand me that marker!"
3) "When her father came home early from work and found us in bed, I was donions."