jark

A seal (stamp or impression of a stamp).

"This is a jark from Jim Ratcliffe," said the taller, having looked at the bit of paper.

To modify (weaponry) to disadvantage; especially, to attach a tracking device to and covertly monitor the location of (a weapon).

At the end of the day, it was inevitable that the IRA would discover that its weapons were being jarked.

'Anna' and 'Mary' were involved in operations that drew on a variety of intelligence data: ‘jarking’; information from agents;[…]One of the weapons, perhaps the Armalite, had been ‘jarked’ by the ‘Det’ and tracked for some time.

Pronunciation spelling of jerk.

First, I felt a kick in my side, and ribs; then I felt myself pulled and jarked about, by the arms and shoulders; and, when I opened my eyes and straightened myself out, to see what alligator hed got hold of me now, what should I see but a squad of four or five of our own Rigiment, all pulling at me at onst!