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Short-cutting "Who would have thought it" or "I cant believe it"
Person 1: "I got tickets to the concert"
Person 2: "Who da thunk it! You da man!"
by Fåtß0¥ June 26, 2005
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Shortened version of 'Who would have thought it to be so?'
James: 4 o'clock, Dave. Tea time!
Dave: Whodathunkit!
by Pequod April 16, 2005
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