Top Definition
When it is clear that two people are having an affair, but think they are successfully hiding it.
Coworker 1: "Dude, do you think Amy and Ryan are screwing on the sly?"

Coworker 2: "Well, if it fucks like a duck...."
by marlopoohbear November 11, 2009
6 Words related to If it fucks like a duck

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