Not Jackable 

A building, fence, object or structure that poses such a risk that it becomes a barrier to entry and requires further brainstorming to find a diversion or incites an unlawful entry.

Jack - that electrified, razor wire, German Shepard patrolled perimeter is definitely not jackable

Other Guy - Watch me and see how it’s done

Jack - *severed by fence spike, entangled in razor wire & watching ear run away in mouth of rabid dog*

Not Jackable by Sangha45 May 7, 2019