Pronunciation: ( —n.hwiz'bang", wiz'-; —adj.hwiz'bang', wiz'-),[key] —n. 1. Mil.a small, high-speed shell whose sound as it flies through the air arrives almost at the same instant as its explosion.
2. a firecracker with a similar effect.
3. Informal.whiz1 (def. 5).
—adj. Informal.first-rate; topnotch: a whiz-bang navigator.Also,whiz'bang",whizz'-bang".