Green’s Dictionary of Slang

cokey adj.

[coke n.1 (1); although cocaine tends to excite rather than dull the senses, so perhaps senses 1 and 3 both coke n.1 (4)]
(US)

1. foolish, silly.

[US]H. Sebastian ‘Negro Sl. in Lincoln University’ in AS IX:4 289: cokey Dopey (figuratively or literally); not all there; sleepy-looking; unambitious.
[US]B. Schulberg Harder They Fall (1971) 292: It may sound cokey, but we could go as high as two million with this fight.

2. (also cokie) habituated to cocaine; cite 1998 refers to widespread cocaine use.

[US]Cab Calloway ‘Minnie the Moocher’ 🎵 She messed around with a bloke called Smokie, / She loved him though he was cokey.
[Aus]New Call (Perth, WA) 21 Apr. 12/8: I recognised the prettiest collection of criminal talent I have ever seen outside a police station. [...] ‘Giggling Dot,’ ‘Cokey Edna,’ and several other notorious women law breakers.
[US]R.L. Bellem ‘Kill That Headline’ in Romantic Detective Feb. 🌐 He’d had a visit from Cokey Joe Breen, who had spilled the facts behind that headline.
[US]S. Longstreet Decade 317: Cokey too, this shamos, and ready to kill on any beef [...] No use knocking against a scut loaded with nose candy.
[US]W.R. Burnett Asphalt Jungle in Four Novels (1984) 206: You’re not talking to some cokie client.
[US]F. Paley Rumble on the Docks (1955) 251: I told you not to bring that cokey bastard.
[US](con. 1940s) J. Resko Reprieve 206: Jenny the Scow and Cokey Flo boarded up their respective bordellos.
[US]C. Fleming High Concept 121: Those were very cokey times.
[US]R. Price Lush Life 123: Terrific reader [..] Unhappy tables, cokey waiters, who’s passing by out there .

3. (US drugs) addicted to heroin; thus Cokey Joe, a personification of a regular heroin user.

[US]N. Algren Chicago: City On the Make 71: Whiskey-heads and hop-heads, old cokey-joes.
[US]F. Paley Rumble on the Docks (1955) 286: It’s that cokey kid from Herring and White.
[US]R.D. Pharr S.R.O. (1998) 108: ‘This cokey bitch has drunk me broke’.