Definitions for killer poke
Any method of inducing actual physical harm to a computer or peripheral by software means, especially by inserting invalid values into a control register or by building up harmonic oscillations in a hard disk etc.
The New Hacker's Dictionary
A recipe for inducing hardware damage on a machine via insertion of invalid values (see poke) into a memory-mapped control register; used esp. of various fairly well-known tricks on bitty boxes without hardware memory management (such as the IBM PC and Commodore PET) that can overload and trash analog electronics in the monitor. See also HCF.