Green’s Dictionary of Slang

1. (later use US campus) excellent, worthy of admiration.

1908		N.-Y. American 2 Oct. in Fleming Unforgettable Season (1981) 279: Young Herzog, who was the candy child today, clouted [...] one good, sincere clout.
1912		D. Lowrie My Life in Prison 153: We’re certainly th’ candy kids when it comes t’ that kind o’ work.
1921		Jerry on the Job [comic strip] I’ll step over and slip some candy gab to old Mr. Popple – he looks worried.
1991		Eble Campus Sl. Fall 1: candy – excellent [...] Garrett’s new red car is candy.
1996		Eble Sl. and Sociability 56: The following functionally synonymous slang terms from two school years, 1990–91 and 1991–92, all mean ‘excellent, worthy of approval’: [...] candy, chicalean, choice, classic, cool, critical.
2007		UGK ‘Gravy’ 🎵 Candy nigga drive candy cars, fuck the D.A. fuck the law.

2. (US) of a job or any other activity, e.g. a crime, easy, undemanding, ‘soft’.

1930		‘Dean Stiff’ Milk and Honey Route 201: Candy – [...] Candy job is the pleasant job. Candy team is the favorite span of mules in the outfit.
1960		(con. 1950-1960) R.A. Freeman Dict. Inmate Sl. (Walla Walla, WA) 23: .
1973		G.V. Higgins Digger’s Game (1981) 130: My little kid could do this one. Pure fuckin’ candy.
1989		D. Sherman There I Was 127: We’d heard [...] CAPs [...] were candy duty, sitting in safe villes [HDAS].