Definitions of cod:

• noun:   major food fish of arctic and cold-temperate waters
• noun:   lean white flesh of important North Atlantic food fish; usually baked or poached
• noun:   the vessel that contains the seeds of a plant (not the seeds themselves)
• verb:   harass with persistent criticism or carping
• verb:   fool or hoax
• adjective:   payment due by the recipient on delivery

  Example: "A COD parcel"

• adverb:   collecting the charges upon delivery