What is Game Time Decision?
A decision that is held off until the moment when it must be made. Very commonly used by professional coaches, especially of the NFL.
Reporter: "Will Portis be ready to play by Sunday?"
Coach: "He didn't practice today, but he's feeling better resting each day this week. He'll be a game time decision against the Cowboys."
Dude #1: "Where are we getting our drink on tonight?"
Dude #2: "Who knows. Let's just make it a game time decision."