Green’s Dictionary of Slang

(US) extremely, very, as an intensifier; usu. modifying positive words like wonderful or fine.

1947		M.H. Boulware Jive and Sl. n.p.: Some kinda fine ... Exceptionally good.
a.1962		‘Duriella du Fontaine’ in D. Wepman et al. Life (1976) 47: I got to her pad, which was some kind of bad, / Filled with a real nice scent.
1971		El Paso Herald-Post (TX) 12 June 9/1: Jerry Nicodemus [...] will leg-up on Some Kinda Man [a racehorse] for the finals.
1972		D. Jenkins Semi-Tough 20: I guess I don’t really need to point out that Miss Cissy Walford is some kind of good-looking [Ibid.] 236: Pardon the language but my game-face is some kind of on.
a.1980		Grand Funk Railroad ‘Some kind of Wonderful’ 🎵 She’s some kind ’a wonderful Yes she is, she’s a / She’s some kind ’a wonderful Yeah, yeah, yeah, yeah.
1987		[film title] Some Kind of Wonderful.
1994		Stage (London) 1 Sept. 20/1: C Venue. Over-Seas House. Some Kind of Love Story.
2005		Palm Beach Post (FL) 4 Dec. 84/5: Something like ‘Some Kinda Day’ has a nice colloquial ring to it.