Qui Que, Who That in French

Why I chose Qui Que for my Cajun French translation of Who Dat for the people who support the "Who Dat Nation" team and all Cajun French speakers in the world? Basically "Qui Que" are French interrogative pronouns that mean who and that or sometimes what, respectively, and can be used on their own or in sentences. The idea was a short quick chant type phrase to use for Who Dat for French speakers. That phrase has caught on and I have trademarked and copyrighted it for use on shirts and other items.
See http://www.cafepress.com/figstreetstudio/7061583 for the designs sold on the web by Fig Street Studio.