Too late in realizing that you've caught in an inescapable deteriorating situation, where there is nothing you could do except tackle it head on and knowing that you probably will not survive when it ends.
Used as a trump card in an argument. The only phrase that can automatically win an argument after this is used is "snakes on a mothafuckin' plane."
Person 1: Pirates are way cooler than ninjas.
Person 2: No way! Ninjas are teh 1337.
Person 1: FALSIFICATION!
Person 2: Rabblerabblerabblerabblerabble!
Person 1: Snakes on a plane!
Person 2: -looks downtrodden- Snakes on a mothafuckin' plane!
Joe- "hey call up jimmy today"
Kenny- "we tried hes snakes on a plane"
Joe- "ok then where is he then"?
Kenny- "i don't fucking know, hes snakes on a fucking plane"