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The Collaborative International Dictionary
Cagmag

Cagmag \Cag"mag\ (k[a^]g"m[a^]g), n. A tough old goose; hence, coarse, bad food of any kind. [Prov. Eng.]
--Halliwell. [1913 Webster] ||

Wiktionary
cagmag

n. 1 (context UK dialect English) A tough old goose. 2 (context UK dialect by extension English) Coarse, bad food of any kind.