pug drink, n. — Green’s Dictionary of Slang

pug drink n.

[dial. pug, the pulp of apples after they have been pressed for cider, which is presumably used to make this]

watered-down cider.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Pug Drink, Waterd Cyder.
1796		Grose Classical Dict. of the Vulgar Tongue (3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1838		W. Holloway Dict. of Provincialisms 133/2: Pug-Drink, Water-cider.