Green’s Dictionary of Slang

lusty cod n.

also jolly cod, rum cod
[SE lusty, massive, substantial + cod n.3 (2)]

(UK Und.) a substantial sum of money.

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[UK]T. Shadwell Squire of Alsatia IV i: Here’s the cole, the ready, the rhino, the darby. I have a lusty cod, old prig.
[UK]B.E. Dict. Canting Crew n.p.: A rum Cod, c. a good round sum of Money. A jolly or lusty Cod, c. the same.