Green’s Dictionary of Slang

(US) attractive, striking, lively; also in adv. use.

1910		T.A. Dorgan in Zwilling TAD Lex. (1993) 52: Al Kaufman is out after ‘Lil Artha’ Johnson with a vengeance and passed out a rather kippy interview in Frisco the other day.
1919		A. Baer Two & Three 22 Nov. [synd. col.] The kippy prima donnas of the New York unemployed who are rich enough to loaf without being arrested.
1920		A. Baer Two & Three 8 Mar. [synd. col.] If a pinch hitter ain’t hitting so kippy Doc pulls his eye tooth.
1922		Davenport Democrat and Leader (IA) 28 May 32/2–3: A kippy pair of oilcans, I’ll say!
1931		P. Stevenson Gospel According to St Luke’s 9: Oh! that’s kippy!