re: "Debris" Roast Beef Poboys -Pictures on Pg. 2

I'm always interested to see what "debris" is at these places.... It's just pot roast.
Real debris (at least in Acadia parish) is a mixture of a bunch shite many people don't want to eat. My great grandmother made it with liver, hearts and usually some roast. Although I'm pretty sure there were sweetbreads or some other shite in there I wouldn't have ate had I known.

Was always a great gravy though.... So the question is why do they call a pot roast po boy a "debris" po boy?

Is debris in NOLA just different?