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1.
The noise that Drinky Crow makes when he drinks XXX.

Since then, it has been generalized to mean any episode of drinking like Drinky Crow.

(Drinky Crow is in the Maakies comic written by Tony Millionaire.)
Sacheezus: I'm thirsty.
Moogie: Dook-dook at the alehouse?
Sacheezus: That's a great idea! DOOK-DOOK!!
by m_mugabo September 24, 2007
 
2.
1. solid excretory product evacuated from the bowels through the anus.
2. something considered disgusting, of poor quality, foolish, or otherwise totally unacceptable.
1. "You're not riding in my car, you done stepped in dook dook."
2. "I'm sorry, but that wing on your front-wheel-drive vehicle looks mighty dook dook."
by the amazing hobo September 15, 2004