whiz bang
[adjective]
Synonyms: excellent, bang-up, capital, dandy, first-class, first-rate, first-string, five-star, top, top-notch

[TahlilGaran] English Synonym Dictionary ▲

whiz-bang also whizz-bang (hwĭzbăng, wĭz-) Informal
n.
One that is conspicuously effective, successful, or skillful:
a whiz-bang of a speech.
adj.
► Conspicuously effective, successful, or skillful:
a whiz-bang ad campaign.
► Very rapid and eventful; rushed:
whiz-bang pacing; a whiz-bang schedule.

[TahlilGaran] American Dictionary ▲

whiz bang
[From whizzbang, a shell used in World War I that was heard only an instant before landing and exploding  : whiz + bang¹.]

[TahlilGaran] American Dictionary ▲