where the truth is delivered in a harsh yet honest way.
Or when the law is taken into one's own hands, in a justified manner.
Someone makes an ignorant comment and they are shut down in and agressive manner e.g. "shut up idiot", Yeah he was talking crap about you bra, so I R-J'd his ass.
Or say for example someone is caught shoplifting and instead of calling the cops, they get a beat down from the shop owner.
"Yeah bra, I gave some R-J to that thieving fool."
There are many other types of rough justice, generally justified roughness.