Green’s Dictionary of Slang

Andy McNish n.

[rhy. sl.]

fish.

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