lefty one out guy
n.— «Relievers have been used for just one batter 1,013 times so far this season.…Most of them are left-handers.…The statistics community has come to call each of them a Loogy, short for Lefty One Out Guy.» —“Why Do Managers Use Some Relievers for One Batter? Because It Works” by Alan Schwarz New York Times Oct. 2, 2005. (source: Double-Tongued Dictionary)