(verb) To fail multiple times for the same reason, then to completely bail out instead of dealing with the consequences upon realization of how terrible one is.
A former player for the Boston Red Sox who is known for his "Manny Being Manny" attitude. It was this lack of teamliness and sportsmanship that caused the team in suumer 2008 to make him a free agent
Guy:"Did you see that guy over there?"
Girl: "You mean the one who's acting like a jerk and letting his team down?"
Guy: "Yup, he's such a Manny Ramirez."