A fruit, vulgarly called an open a-se; of which it is more truly than delicately said, that it is never ripe till it is as rotten as a t—d, and then it is not worth a f—t.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Mealy-mouthed * MellowNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes