Green’s Dictionary of Slang

(US) disgusting, esp. sticky, slimy.

1964		S. Bellow Herzog (1965) 277: He writes poems and reads them to Mama... He looks ooky when he says them.
1969		‘Thom Demijohn’ Black Alice 149: The milk was so warm and ooky it was like yogurt .
1972		M. Rodgers Freaky Friday 113: It’s an ooky idea anyway.
1988		Smithsonian Nov. 48: Another customer has rejected a cake because the design is boring and the color red is ‘ooky’ [HDAS].
1991		Vanity Fair (N.Y.) Oct. 220: They’re definitely mysterious and undoubtedly ooky; they do live in a museum [HDAS].
1998		S. Cox Addams Chronicles: An Altogether Ooky Look At The Addams Family (2nd edn) edn tag required as subtitle only contains ooky on 2nd edn [title] .