Like a "Black Sawn Event" but way less significant. When something seemingly nice turns straight negative, in an unexpected way, or in a scale or manner that is unanticipated.
"Hey, this summer rain is really nice... I wonder how long it will last..." Check weather... "Oh no, there is a flash flood and tornado warning that was just issued! This is a real Black Duck Event."
by toms35 August 18, 2021
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