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1.
Adj. To be; emptied, finished, or, done with.

Used by southwest Canadians to describe something that is emptied, finished, or, done with.

Origin: Created by the J-Burg Krew founded in the areas of Amherstburg and LaSalle, as a term to describe a "bowl" or marijuana which is finished, or, comprised of remaining ash.
"Man pack another bowl, this one is poonsh'd."

or,

"I need another beer this one is poonsh'd"
by J-Burg Krew March 09, 2010