One easily imposed on. To gudgeon; to swallow the bait, or fall into a trap: from the fish of that name, which is easily taken.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Gruts * GullNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes