Green’s Dictionary of Slang

(US black) to outwit, to outsmart.

1941		Pittsburgh Courier 24 May 11: To outslick, out-figure, and outsmart the rest of the gambling playboys [HDAS].
1962		‘Konky Mohair’ in D. Wepman et al. Life (1976) 104: Now the young whores is trying to outslick me.
1972–74		Hawes & Asher Raise Up 111: Outslicking him and the cops all down the line [HDAS].