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A Die-Hard Who Dat is someone that shows extreme, absolute or complete loyalty for the New Orleans Saints even when they are playing like they did back in the 80's. A Die-Hard Who Dat could also be someone who is a member of The Big Easy Mafia fan club, where "Once You're In..... You're In For Life"
The Superdome is filled with Die-Hard Who Dats. They are the only ones who would show up with them playing like this.
by NOLAmayor December 03, 2015
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