jiggler

jiggle +‎ -er

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jiggler (plural jigglers)

1. Someone or something that jiggles.
2. (slang) A key, now especially a car key, that has been partially ground down so that it will open many locks.
   • 1937, Journal of Criminal Law and Criminology:

     This may be accomplished by means of jiggler keys used for opening door locks. Such keys are of two types: those for opening locks having two sets of tumblers, and those for opening locks having only one set.

   • 2011, Seattle Meth and Car Theft, page 120:

     I knew about the whole key “jigglers.” Basically, random car keys are shaved down with a file, rounding out sharp edges.

• mouse jiggler