A thirsty fellow, a great drinker. To spunge; to eat and drink at another’s cost. Spunging-house: a bailiff’s lock-up-house, or repository, to which persons arrested are taken, till they find bail, or have spent all their money: a house where every species of fraud and extortion is practised under the protection of the law.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
To Sport * SpunkNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes