Jack of the crab whom is jackable also know as ' cracker jack'. To be labeled as 'jackable' means you resemble jack as one of the most disrespectful people in the whole world.
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
A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.