Green’s Dictionary of Slang

Andy McNish n.

fish.

1960		J. Franklyn Dict. of Rhy. Sl. 32/1: Andy McNish Fish. Either raw or fried. Early 20C.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
2002		Rick Walton Sl. to Eng. Dict. 🌐 Andy McNish – fish.