Green’s Dictionary of Slang

scoosh n.

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

(Scot.) whisky.

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