Boozoo is usually hard for me to understand, but I could hear him pretty clear on here. Not sure how you are on the french, but that line "mam a fait des biquits, et y en a pas d'sirop", means "mom made some biscuits, but there's no syrup". Not sure if "y en a (may be il y en a) is used in standard French today, seems like I heard somewhere it isn't, but it's used a lot in La French. Guess Boozoo can't do breakfast with dry biscuits.
I've seen it spelled different ways, and there may be some disagreement even among the scholars, but the pronunciation is sometimes "ee on nah pas", sometimes "ee nah pas", and sometimes all you hear is the "nah pas", meaning there is none and I think the different pronunciations are contractions. Cajuns are notorious for removing vowels. Marc would know better than me, but I thought I thought it's "y en a pas", because the only time I hear that "n" sound is when it is referring to an understood subject, which "en" is used as "some". Like in this case, it's understood it's biscuits there's none of. If he actually used biscuits as the article, I'd expect to hear "y a pas des biscuits" (no "n" sound). Someone please correct me if I'm wrong, but this is how we usually use it. And you're correct, David, I can't think of a time where the "ne" negative is heard in La French, though there may be exceptions.