Jahn confirms it: “He does slam down the bat, and he gives the umpire a dirty look.”
Clark, the first Jewish American League umpire, adjudicated baseball for three decades.
Swearing at an umpire because of fan interference is a quick way not to become a tennis favorite.
c.1400, noumper, from Old French nonper "odd number, not even," in reference to a third person to arbitrate between two, from non "not" + per "equal," from Latin par. Initial -n- lost by mid-15c. due to faulty separation of a noumpere, heard as an oumpere. Originally legal, the gaming sense first recorded 1714 (in wrestling).
c.1600, from umpire (n.). Related: Umpired; umpiring.