Green’s Dictionary of Slang

skish n.

[? echoic of slurred tones]

(US) a state of drunkenness.

[US]B. Fisher A. Mutt in Blackbeard Compilation (1977) 116: Here I am with – hic – another skish on. [Ibid.] 131: That cocktail cherry will die with an awful skish on. Not so bad, huh?