During an episode of The Practice, the context can be understood from the actor's whole line.
Ellenor: Now, I suppose it is politically incorrect to call cancer victims a bunch of whiners, but let's fess up. No other lawyer would touch this case because it is a case that stinks. Did those power lines give you cancer? My bet is yes. Can we prove it in a court of law? My bet there is a resounding, "No." He took this case not because he was greedy, but because he felt sorry for you. And against all odds, he got you an offer like this, it's a miracle. Close to a million dollars, I am sorry, but that is as good as it's gonna get. And while you have the right to reject, if you do, I am gonna recommend Bobby to drop you as clients. We are sympathetic, but we are certainly not gonna bankroll your rage.
Bankroll means providing the money that someone needs for a plan, business. How can you make a figurative meaning out of this?