Green’s Dictionary of Slang

1. (US gay) attractive, appealling [SE kissable].

1938		Pittsburgh Courier (PA) 12 Nov. 19/11: George Wiltshire looks kissey in his silk topper.
1949		‘Swasarnt Nerf’ et al. Gay Girl’s Guide 12: kissy: NYC MBS [Male Bobby-Soxer] adjective used loosely for anything, usually inanimate, which arouses speaker’s enthusiasm.
1972		B. Rodgers Queens’ Vernacular.

2. (US) sycophantic [kiss ass v.].

1971		E.E. Landy Underground Dict. (1972).
1983		R. Price Breaks 348: I wasn’t usually such a kissy fuckhead when it came to words of love.