Green’s Dictionary of Slang

jilter n.

[jilt v.]

(orig. US) a sneak thief.

[US]Matsell Vocabulum.
[UK]Cornhill Mag. vii, 91: Another notable class of criminals called jilters or Noteblankers: they go pairs [F&H].
[US]Trumble Sl. Dict. (1890).
[UK]R. Fabian Anatomy of Crime 193: Jilter: Hotel thief.
[UK]J. Morton Lowspeak.