E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Pig and Whistle.
The bowl and wassail, or the wassail-cup and wassail. A piggen is a pail, especially a milk-pail; and a pig is a small bowl, cup, or mug, making milk and wassail; similar to the modern sign of Jug and Glassi.e. beer and wine. Thus a crockery-dealer is called a pig-wife.