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This is something that you say when someone passes gas audibly. It refers to the similarity of a farting sound to the quacking sound made by a duck.

In some cases, this expression is used by the farter to comically deflect the embarassment. In other cases, it is used by a bystander to comically point out the fart to the general public.
What is that smell? Did someone step on a duck?
by GangerDay July 26, 2010