Green’s Dictionary of Slang

slanger n.

[slang v.1 (1) or SE sling, to throw]

(UK Und.) a thief or pickpocket who uses an assistant to carry the stolen goods.

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[UK]Life and Character of Moll King 12: harry.: But who had you in your Ken last Darkee? moll.: We had your Dudders and your Duffers, Files, Buffers, and Slangers. [Ibid.] 24: Slangers, Thieves who hand Goods from one to another.