Green’s Dictionary of Slang

(US) assured of success; completely in control (of).

1975		G. Underwood ‘Razorback Sl.’ in AS L:1/2 57: dicked adj Assured of success ‘Boy, you have it dicked!’.
1982		(con. 1970) J.M. Del Vecchio 13th Valley (1983) 2: ‘You REMF fuckin candyasses sure got it dicked.’.
1991		B. Hamper Rivethead (1992) 59: We always remembered the night we had you and you and the rest of the world thoroughly dicked for seventy-two minutes.
2001		(con. 1964–8) J. Ellroy Cold Six Thousand 251: I’starting to think the white man’s got it dicked, he’s got all the bread and the white women and the hi-fi shit.