Murderize

[Greta]

to [destroy] or [obliterate] a living being through excessive [violence], force, or murderization

[Dianne]

To [obliterate], destroy, or kill something, usually a living being, using excessive [violence] and/or force.
Another way to describe murderizing something would be [overkill].

It is not used often, and even when it is used it is often ridiculous and non serious