jiggler

plural jigglers

1. Someone or something that jiggles.
2. slangA key, now especially a car key, that has been partially ground down so that it will open many locks.

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

   2011, Seattle Meth and Car Theft, page 120

   1 more example

   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.

   1937, Journal of Criminal Law and Criminology

   Synonyms: jiggle key, jiggler key

3. A small, heavy valve on top of a pressure cooker to release steam periodically.