(Noun) 1. In the automotive trade, a metal breaker bar used to increase leverage on a stubborn fastener.
2. A length of heavy duty 2" ID steel piping used for dealing with, or "negotiating", difficult situations or people.
"Damn that crank bolt is on tight, better use the negotiator on it"
"If that noob doesn't give me my money I'll have to introduce him to the negotiator"
in a typical adventuring team, the person who socializes and talks information out of the rumor mill.
negotiator: well, I was kissing my way down his thigh when he mentioned...