Green’s Dictionary of Slang

ginchy adj.

[ginch n. (1) + sfx -y]

attractive, sexy.

[US]I Taylor ‘Kookie, Kookie, Lend Me Your Comb’ [lyrics] Baby, you’re the ginchiest.
[US]H. Ellison Rockabilly (1963) 107: They soon became known as ‘The Ginchy Set’.
[UK]Mersey Beat 31 Aug.–14 Sept. n.p.: I think George is the utmost, ginchiest, skizziest, craziest cool cat I’ve ever seen.
[US]S. King It (1987) 933: Everything would be good then; everything would be the ginchiest then.
Potter et al. Mac OS X Security xiii: And then there are thanks to my parents who gave me my first modern Mac (with a ginchy new PowerPC in it).