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1.
To be complete or finished. A word typically used when all the marijuana has been exhausted.
Some people use it simply as to be complete/finished, but this word only applies to MJ.
Dude, the bowl is kieshed.

bad example: Man, I am so kieshed out from last night.
by Dubba Trubba February 27, 2005
 
2.
orig. Midwest United States

When a bowl of marijuana has been fully consumed or burnt. This can be brought upon via flame or the cooking method employed by a vaporizer.
Matt: "Dude, that bowl was seriously kieshed when you handed it to me!"

Chad: "It was not kieshed! At least you swallowed the Scooby Snacks."
by Mojo the Rev. February 12, 2009