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To reach one of the highest states of intoxication. It is beyond being wasted.
"What the hell happened last night? Everyone was so roostered no one remembers a thing"

"I'm gettin ROOSTERED!"
by Browndoza April 06, 2008
The state in which an individual is drunk, high, and has just eaten a meatball sub.
Let's grab our booze, weed, meatball subs and go get roostered down by the pool!
by beachweekkkk May 30, 2010