It's a way of calling the fish blue whiting (Micromesistius poutassou), especially the already cooked fish. It is probably an Andalusianism for cod ( Gadus morhua L . ) . By the definition of the Anonymous colleague see "to put the cod".
Bacala : In Mexico, person who comes from a party where alcoholic spirits are drunk.
Blue whiting: Tarifa (Cádiz. Spain), giving the appearance of truth lie.