bungnipper

Dictionary of The Vulgar Tongue by Francis Grose

A pick pocket. To file; to rob or cheat. The file, or bungnipper, goes generally in company with two assistants, the adam tiler, and another called the bulk or bulker, Whose business it is to jostle the person they intend to rob, and push him against the wall, while the file picks his pocket, and gives'the booty to the adam tiler, who scours off with it. CANT.