Green’s Dictionary of Slang

fortuni adj.

[? Spanish luxury textile and haute couture designer Mariano Fortuny (1871-1949]

(Polari) of a man, very attractive.

[UK]P. Baker Fabulosa 292/1: fortuni gorgeous.
[UK]R. Milward Man-Eating Typewriter 33: A fortuni chiselled husband who’d stuck his colin in the most meese greaser on your strasse.