More on Cag Mag from Infoplease:

• Cag Mag - Cag Mag Offal, bad meat; also a tough old goose; food which none can relish. (Gaelic and Welsh, cag ...
• Geese - Geese (g hard). (See Gander , Goose.) Geese save the capitol. The tradition is that when the Gauls ...
• Dictionary of Phrase and Fable: C - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "C"