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Top Definition. dog whistle. Dog whistle is a type of strategy of communication that sends a message that the general population will take a certain meaning from, but a certain group that is in the know will take away the secret, intended message. Often involves code words.
To human ears, a dog whistle makes only a quiet hissing sound. The advantage of the dog whistle is that it doesn't produce a loud irritating noise for humans that a normal whistle would produce, so it can be used to train or command animals without disturbing nearby people.