Green’s Dictionary of Slang

scoosh n.

[SE Scotch ? + Scots dial. scoosh, to plunge (i.e. the effects) or play on hooch n.1 (2) ]

(Scot.) whisky.

[Scot]T. Black Gutted 1: In my current condition, wedded to a bottle of scoosh and smoking forty, scrub that, sixty a day.