whizz (v.) "make or move with a humming, hissing sound," 1540s, of imitative origin. Meaning "to urinate" is from 1929. Related: Whizzed; whizzing. The noun is recorded from 1610s. Whizzer "something extraordinary" is from 1888.
whizbang (n.) also whiz-bang, whizz-bang, 1915, originally a soldier's name for a type of German artillery shell in World War I, so called by the Allied troops in reference to its characteristic sound. From whizz + bang (v.). whiz (n.) "clever person," 1914, probably a special use of whiz "something remarkable" (1908), an extended sense of whizz; or perhaps a shortened and altered form of wizard. Noun phrase whiz kid is from 1930s, a take-off on a radio show's quiz kid.