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A nickname for Kratom, or mitragyna speciosa, which is a popular ethnobotanical legal in some countries including the United States. Even a small amount of this substance is punishable by death in Thailand. Using the word 'kratz' as opposed to Kratom is also a great way to obscure the drug's identity from non-users.
We ate about two tablespoons of kratz and we were flying Gish before the family reunion.
by Sassymonkeysocks August 08, 2011