Green’s Dictionary of Slang

(US) fast, stylish, high-flying.

1946		H.A. Smith Rhubarb 20: There’s a sloppy at Bonwit’s and Myra yearns for it. It’s zoomy! It’s groovy! It’s beauteous! It’s lush! It’s eighteen bucks!
1969		Autocar 131 n.p.: [advert] The Herald 13/60 [...] has a zoomy 1296cc engine, delivering 61 bhp .
1982		G.V. Higgins Patriot Game (1985) 97: The couples jet off by themselves for a couple weeks à deux in Honolulu. Really zoomy people.