JoSoMo means in slang: This is the killer combination of late-inning and bullpen for 2011 New York Yankees. This combination includes Mariano Rivera, Rafael Soriano and Joba Chamberlain. Each successive inning presents a greater challenge to any opponent team. Their names can be abbreviated JOba or SOriano and MarianO, which makes them a deadly combination that causes fear in the whole baseball country. (in Slang Dictionary, added by Troglodyte)