He grins like a Cheshire cat; said of anyone who shews his teeth and gums in laughing.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Cherubims * Chick-a-biddyNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes