An obviously faulty endeavor; also as ~ /won't hunt/, predictive of failure.
No go, non-starter

pseudo-country-bumpkin wisdom uttered in response to news item or rumor designed to scandalize a political opponent.

The idea is that the rumor is either very easily refuted or is unimportant to the public, and thus is as worthless as a dog who won't hunt.

1. a way of saying a particular man is a homosexual, wimp or sissy. used by the Bush administration in the campaign against Kerry by using a picture of a fox hound wearing a tutu with the caption "that dog don't hunt," referring to the eventual state of the nation if Kerry had won.

2. a way of saying you or someone else is not interested in a particular activity.