I've heard, though I can't recall the source or point you in the way of a verification, that the phrase "Jakomo fi na nay" fits in with the bragging/boasting/challenging nature of the song "Brother John" as sung by the Indian gangs/tribes during Mardi Gras. The phrase is reputed to be a made up string of words which means loosely, "And if you don't like it, you can kiss my butt!"

I'm just sayin' is all....

- Sean