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is an English idiom originating from New Orleans for over a century. First referenced in poetry, the phrase was a common dialogue element between the performers and crowd at traveling minstrel shows in the region. Eventually, the phrase became used in US cinematic productions for two decades, including TV and movies. In WWII, the phrase became known as a source of entertainment for American soldiers. More recently, the phrase 'Who dat?' has become a chant of team support. It's most widely used by fans of the New Orleans Saints, an American football team. The entire chant is: "Who dat? Who dat? Who dat say dey gonna beat dem Saints?" "Who dat" may also be used as a noun, describing a Saints fan.