If cracking corn refers to what one said is, talking about something as in gossip, it makes sense that there is still plenty of talk about the events of Massa's death.

All through the song the phrase repeats. There is all this talk about something that has been decided. The verdict being it was the Blue Tail Fly's fault that Massa is dead. You can talk all you want and I don't care because I am cleared of this crime.

The song is a celebration of the verdict and say what you will.

With respect to all, mho.

Pete