Green’s Dictionary of Slang

(US teen) fine, good, exciting.

1960		Taunton Courier 23 July 3/6: American slang [...]I dream of a not too hinkty ginch [...] But no geets, no zooly.
1961		F. Kohner Gidget Goes Hawaiian 30: I mean this real dippy Hawaiian Village [...] the Halekulani Hotel. It looked old and islandish and had these banyan trees and palms and cottages no higher than twenty feet. Real zooly. [Ibid.] 50: We all got up and had the first joyride of the day. It was zooly.