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1 definition by Owen Powers Donovan

 
1.
The sound uttered to signify that someone just got scammed or publically shamed.
A guy fails at picking up a girl and walks back to his friends. He is met with a chorus of "Quaaack."

or

"That sucker got seriously quacked by the salesman at GoodGuys. Buyer Protection Program? Quack!"
by Owen Powers Donovan July 30, 2003