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One of the greatest mysteries in the history of football revolves around Peyton Manning's favorite word, "Omaha."

Why does he say it? Is it an audible? Is it a check-down? Does he like the city? Does billionaire and Omaha-native Warren Buffett give him $5,000 every time he says it on national television? Is it Peyton's way of saying that he's going to move there after he retires?

Only people who have actually played with Manning know the real answer to the "Omaha" riddle and lucky for us, one of his ex-teammates went on NFL Network on Sunday to spill the beans on what "Omaha" actually means. 

Former Colts receiver Reggie Wayne, who caught passes from Manning for 10 years in Indy, explained that the meaning of "Omaha" is actually pretty simple. 

"Omaha means, he's going the other way," Wayne said. "If it's a run to the right -- if it's dive right, 'Omaha' is gonna be dive left."

However, Wayne did point out that the Patriots probably shouldn't develop a defensive game plan around his "Omaha" revelation. 

"'Omaha's not going to be the same thing [vs. New England]," Wayne said. 

Anyway, Wayne isn't the first person to try and explain what Omaha means. Peyton and Eli Manning have both explained it recently, without actually explaining anything. 

What will Omaha mean on Sunday? How many times will Manning say it?

To find out, just turn on CBS at 3:05 p.m. ET for the AFC title game. If you won't be near a television on Sunday, you can stream the game for free here at CBSSports.com.

Reggie Wayne is revealing Peyton Manning's secrets. (USATSI)
Reggie Wayne is revealing Peyton Manning's secrets. (USATSI)