Onomatopoeic exclamation imitating a rushing or hissing sound.
Definitions
Used to represent or draw attention to a hissing or rushing sound made by something moving swiftly. "Whiz!" The arrow streaked past the target.
Used attributively to indicate exceptional speed, skill, or efficiency.
Definitions
(informal, attributive) Extremely smart, fast, or efficient. Their new app offers a whiz solution to tracking expenses.