[n. hwiz-bang, wiz-; adj. hwiz-bang, wiz-] 
| 1. | Military. 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). |
| 4. | Informal. first-rate; topnotch: a whiz-bang navigator. |
