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Dog-whistle politics is political messaging employing coded language that appears to mean one thing to the general population but has an additional, different or more specific resonance for a targeted subgroup. The phrase is often used as a pejorative because of the inherently deceptive nature of the practice and because the dog-whistle messages are frequently distasteful to the general populace. The analogy is to a dog whistle, whose high-frequency whistle is heard by dogs but inaudible to humans.
The term can be distinguished from "code words" used in some specialist professions, in that dog-whistling is specific to the political realm. The messaging referred to as the dog-whistle has an understandable meaning for a general audience, rather than being incomprehensible.
Origin and meaning
According to William Safire, the term "dog whistle" in reference to politics may have been derived from its use in the field of opinion polling. Safire quotes Richard Morin, director of polling for The Washington Post, as writing in 1988, "subtle changes in question-wording sometimes produce remarkably different results.... researchers call this the 'Dog Whistle Effect': Respondents hear something in the question that researchers do not", and speculates that campaign workers adapted the phrase from political pollsters.