Definition of scramming:
(v) :
(intransitive, originally US, often imperative) To leave in a hurry; to go away.
(v) :
(transitive) To shut down (a nuclear reactor or, by extension, some other thing) for safety reasons, usually because of an emergency.
(v) :
(intransitive) Of a nuclear reactor or some other thing: to shut down, usually because of an emergency.
(n) :
(also attributively) A shutdown of a nuclear reactor (or, by extension, some other thing), often done rapidly due to an emergency.
(n) :
The device used to shut down a nuclear reactor; also, the button or switch used to initiate a shutdown.
(n) :
(MLE, slang) A gun, firearm.