BAUBEE,
an Halfpenny; as The Cove ript the Maund but a single Baubee let's souse him for it i.e. The Gentleman has given the Beggar but a single Halfpenny; lets plunder him for his Niggardliness.
The Vulgar Tongue originally collected by Grose, 1811.
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).