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A bar-boy; also a bastard or any other child. To stifle the squeaker; to murder a bastard, or throw It into the necessary house.—Organ pipes are likewise called squeakers. The squeakers are meltable; the small pipes are silver. Cant.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Squeak * Squeeze CrabNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.