Green’s Dictionary of Slang

1. a general term of approval, admiration [schizzy adj. on bad = good model].

1961		Mersey Beat 31 Aug.–14 Sept. n.p.: I think George is the utmost, ginchiest, skizziest, craziest cool cat I’ve ever seen.
1963		Kingsport Times-News (TN) 24 Nov. 82/1: The Hip Chick’s cat will know she’s no goopus and is really ginchy when she sports this skizzy snicker slicker.
1988		(ref. to 1960s) McGill Dict. of Kiwi Sl. 103/2: skizziest very good; 1960s teen slang, usually girls.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

2. disgusting, dirty, repellant, a general term of disapproval [var. scuzzy adj. (1)].

1970

B. Jackson Get Your Ass in the Water (1974) 230: Before I’d get between those slimy thighs / and suck those skizzy tits, / I’d rather drink a barrel of buzzard puke.