Although these are generally considered nonsense words, people say that "Gitchi yaya dada" is how New Orleans prostitute say "get your sex, daddy." However, so far, there isnt any proof of this, but it certainly sounds reasonable.
Mocha chocolata is the reference to the prostitute's light brown skin color. Voulez-vous coucher avec moi, ce soir means Do you want to
sleep with me tonight (This is French, not slang)
Creole is a person of French or Spanish descent, who is a native inhabitant of Louisiana.
I hope that answers many of peoples queries!!!