I think it is form the French but in common life they do not pronounce it in french way. They say more like it would be Italian - dakurdo. I have heard it in northrern Tunisia, in part where Italians were ruling the town for many yeras past in the history, so may be it is local.
Dakurdo means similar like in France - of course or OK, good
Janan - I think you mis heard this word - I live in the North