To beat. Fib the cove’s quarron in the rumpad for the lour in his bung; beat the fellow in the highway for the money in his purse. CANT.—A fib is also a tiny lie.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Feuterer * FiceNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes