Green’s Dictionary of Slang

attractive, sexy.

1959		I Taylor ‘Kookie, Kookie, Lend Me Your Comb’ 🎵 Baby, you’re the ginchiest.
1961		H. Ellison Rockabilly (1963) 107: They soon became known as ‘The Ginchy Set’.
1961		Mersey Beat 31 Aug.–14 Sept. n.p.: I think George is the utmost, ginchiest, skizziest, craziest cool cat I’ve ever seen.
1986		S. King It (1987) 933: Everything would be good then; everything would be the ginchiest then.
2003		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).
2023		(con. 1962) J. Ellroy Enchanters 33: The Brentwood quasi-village was [...] upscale ginchy.
2024		J. Meades Empty Wigs (t/s) 435: She hooted with laughter: ‘That’s the ginchiest criticism I ever did hear’ [ibid.] 762: Part-Time Tabitha with her ‘ginchy urchin cut... do it myself with nail scissors’.