Well he has to say mike when he points out which LB is the mike on that play and Omaha lets everyone know hes about to snap when hes short on time. I might be a bit off on Omaha but Im pretty sure thats why he yells those.
It would be funny if he said, "GO" which is just 1 syllable. It would be quicker.
If its to remain 3 syllables how about "Go-dad-dy"
I mean it was hysterical, as other teams realized that "Omaha" meant he was going to snap it soon.