n. /hwiz"bang', wiz"-/ ; adj. /hwiz"bang", wiz"-/ , 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. whiz 1 (def. 5).
adj.
4. Informal. first-rate; topnotch: a whiz-bang navigator.
Also, whizbang, whizz-bang .
[ 1910-15; orig. imit. ]