E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
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 Common-wealth, hanged a man first and tried him afterwards.
Jedwood justicehang in haste and try at leisure.Scott: Fair Maid of Perth, chap. xxxii.