Green’s Dictionary of Slang

(US) weak, ineffectual.

1953		L. Uris Battle Cry (1964) 191: Come on, Burnside, getting candy-assed?
1977		(con. 1969) M. Herr Dispatches 124: The grunts called it [i.e. a safe bunker] the Alamo Hilton and thought it was candy-assed.
1989		(con. 1969) W.E. Merritt Where the Rivers Ran Backward 271: All those candy-assed engineers got me here after all.