Icky

google

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1930s: perhaps related to sick1 or to the child's word ickle.

wiktionary

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1935, American English; from icky-boo (circa 1920): sickly, nauseated; baby talk corruption of sick; from a sentimental term for Jazz music.

etymonline

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icky (adj.)

1935, American English, probably from icky-boo (c. 1920) "sickly, nauseated," which probably is a baby talk elaboration of sick (adj.). Originally a swing lover's term for more sentimental jazz music; in general use, "sticky and repulsive," from 1938. Also a noun, "person with conventional taste in jazz," 1937.