Pilferers, or petty thieves, who, with a stick having a hook at the end, steal goods out of shop-windows, grates, &c.; also those who draw in or entice unwary persons to prick at the belt, or such like devices.
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.
Anchor * Angling For FarthingsNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes