Top definition
1. When an athlete of great ability blows in the big game.

2. When an overwhelming favorite losses badly.
"Man, I can't believe Michigan lost to Appalachian State, they definitely went Bitch Gannon."

"After winning the league MVP, Rich Gannon became Bitch Gannon and threw more touchdowns to the Buccaneers than to the Raiders in the the Super Bowl."
by Alex Wilson Mother Fucker September 06, 2007
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