The altered mental state reached when one has either consummed alcohol (or recreational drugs) beyond one's functional limit, or has stayed awake for too many consecutive hours, regardless of intake. Due to this state, one may blurt out things that one normally wouldn't, or do stupid things that don't make sense; totally irrational behavior based on lack of sleep or toxins present in the blood stream.
"Ma'am, do you know why I pulled you over?"
"Officer, I was just on my feet for a 16 hour shift with no break, of course I'm speeding. I'm totally pass outable."
"I see. Well, keep your window and your eyes open. Why don't I follow you home to make sure you get there ok."
"How much did you drink?"
"Well, let's just say I'm feelin' mighty pass outable right now."