A wench. A damned good or bad piece; a girl who is more or less active and skilful in the amorous congress. Hence the (CAMBRIDGE) toast, May we never have a PIECE (peace) that will injure the constitution. Piece likewise means at Cambridge a close or spot of ground adjacent to any of the colleges, as Clare-hall Piece, &c. The spot of ground before King’s College formerly belonged to Clare-hall. While Clare Piece belonged to King’s, the master of Clare-hall proposed a swop, which being refused by the provost of King’s, he erected before their gates a temple of CLOACINA. It will be unnecessary to say that his arguments were soon acceded to.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
To Piddle * PigNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes