Banjo Hitter (1929)

“Summa is what Nick Altrock calls a ‘banjo hitter.’ He chokes his bat and plunks hits just over the infield.” Siff newman, “Dusting ’em Off,” Birmingham (AL) News -Age Herald, January 20, 1929, Sports Section p4

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):

“A ‘banjo hitter’ is one who hits pop flies over the field.”  (Baseball Magazine, Jan. 1943; David Shulman).