When a person sacrifices a toe nail in order to save the life/lives of a person/people who may or may not have been forced in to a very hostile hostage situation, usually resulting in the prevention of thousands of fatalities and/or a significant increase of activity in the illegal ivory trade.
Andrew: "Come on man, you know this is wrong, just stop this madness just let them go, I'll do anything!"
Terrorist:"You know there's only one thing you can do Andy, you wanna be a hero well it's time to show your true colours!"
Andrew:"You dont mean........."
Terrorist:"Yeah Andy boy I mean it and i mean it good its time for a TOE NAIL SACRIFICE!!!"