An unlicked cub; an unformed, ill-educated young man, a young nobleman or gentleman on his travels: an allusion to the story of the bear, said to bring its cub into form by licking. Also, a new gamester.
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.
Crusty Fellow * CuckoldNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes