Noun: A gadget, usually in the form of a plug or socket, inserted into an electronic device in order to test or bypass interlocks. Also used to make the damn thing work because the interlock has failed at a critical time. USA Navy slang, WWII vintage, now much used in the USA National Labs.
Verb: To bypass an interlock, either directly with a jumper, or by the use of a "bugger".
Bugger out the Radiation Chain. Use the X-Ray Safety bugger.