The act of unconditional surrender without confrontation and willfully providing whatever is desired to an aggressor.
Guy 1: So, you let that bully kick your dog, and sodomize your girlfriend, after which you gave him all the money in your wallet and wished him a pleasant weekend?
Guy 2: Yep
Guy 1: Wow, you've mastered the art of French Negotiation!
Retro-negotiate: To offer up new terms and conditions to a deal previously made when the outcome does not go your way.
Joe thought he would win the bet but when he lost, he tried to retro-negotiate the amount he now owed.