this is on the top of my web search for “street justice” definition:
Street justice is a police response to a community mandate calling for action to be taken when formal institutions will not or cannot respond for various reasons. This street justice function has created widespread concern, particularly when police officers simultaneously display ethnic or racial prejudice.
from abstract of
NCJ 151407
Street Justice: A Moral Defense of Order Maintenance Policing (From Police and Society: Touchstone Readings, P 139- 154, 1995, Victor E. Kappeler, ed. - See NCJ-151401)
G W Sykes
1995
https://www.ncjrs.gov/App/publications/abstract.aspx?ID=151407
urbandictionary definition:
Punishment or payback rendered at the hands of a vigilante or any other punishments given outside of official channels. Often times the punishment is illegal and excessive for the violation.
Linda parked her car in my spot for the 3rd time this month; I handed out a little street justice by slashing her tires.
http://www.urbandictionary.com/define.php?term=street%20justice
apparently it is also the subject of a few hollywood movies and tv series.
I already know what the darn street term means. I want to know what the poster meant before I accused him/her of something