Putting an obnoxious person to death first, and trying him afterwards. This sort of justice was dealt to moss-troopers. Same as Jedburgh justice, Jeddart justice. We have also “Cupar justice” and “Abingdon law.” Of the last we are told that Major-General Brown, in the Commonwealth, hanged a man first and tried him afterwards.
“Jedwood justice—hang in haste and try at leisure.” —
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894