that dog don't hunt

Meaning: response to a "fact" or rumor that is easily refuted or unimportant, thus making it as worthless as a dog who won't hunt

Wait a dern second! Santorum and Ron Paul ain't even actively campaignin' in Flarda. How in the blazes do them Gingrich folks call a second place finish a win? That dog don't hunt! You know what Ricky Bobby says: if you ain't first, yer last.

*CountryTawk does not endorse any particular political candidate. We simply wanted to use this phrase in the original context in which we heard it.