battery chucker
n.— «The Fox smash “Trading Spouses: Meet Your New Mommy” has asked the Daily News to help them find a Bronx Bombers backer whose family is just as nuts about the Yanks. “I refer to them as battery chuckers, hard-core fans.”» —“Reality show seeks Bronx Bomb-ma fanatic” by Bill Hutchinson New York Daily News June 15, 2006. (source: Double-Tongued Dictionary)
“Battery chucker”: baseball fan who delights in tossing refuse into opposing team’s bullpen. (pitcher + catcher =battery, get it?). By extension, or by taking metaphor for reality, baseball fan who delights in tossing batteries into opposing team’s bullpen. Cf. John Rocker’s reception in Shea Stadium after notorious #7 train comments.
From Jim Rome’s website http://www.jimrome.com/home/jungle/smacktionary.html – Battery Chuck Northern Californian; see also ‘No-Cal’, ‘Water Hoarder’ [from the perceived tendency of Bay Area fans to throw batteries at opposing players, particularly at those from Southern California]