Green’s Dictionary of Slang

cod n.3

[SE cod, a bag; thus early 16C SE cod, the scrotum, which itself, despite Grose’s citations, is only slang in pl., i.e. cods n.1 (1)]

1. [mid-17C+] (also cod-root, codshead) the penis.

2. [late 17C–early 19C] money; thus lusty cod n.

3. [late 17C–19C] a purse.

4. [1980s+] (drugs) a large amount of money.

In compounds

cod-piece (n.) (also cod-piece point) [SE cod-piece: the flap on breeches which covered the male genitals worn until c.1600]

[17C] a euph. for the penis; also attrib.

cod trench (n.)

[1990s+] the vagina.

In phrases