Sounds like the syntax for error reporting in certain compilers, or a cursor position instruction in some old displays.
It makes some sense in the quote about Melvin (from the show Now You See It, hosted by Mike Meade), since Melvin was a robot.
But it is pretty too obscure and arcane for someone to just throw it into a football discussion and expect others to have a clue what he’s on about.
EDIT: Age has not been kind to my memory banks. A bit of googlation tells me that “Line 1, Position 3” is actually something that might have been said during the game Now You See It. Contestants had to find words in a grid, and specified the location of the words using such phrases.
EDITAGAIN: As I should have guessed, there were versions produced elsewhere, not hosted by Mike Meade and not featuring a robot. Ignore my robot comments above, they are irrelevant. There was a version made by Scottish Television.