impimpi

plural impimpis

1. South AfricaA police informer.

   They're almost certainly impimpis, bastards who betrayed and murdered comrades.

   2012, Nadine Gordimer, No Time Like the Present, Bloomsbury, published 2013, page 20

   1 more example

   Within some communities, vigilante justice was used to identify, punish, and kill political sell-outs, known as impimpis.

   2005, Ksenija Bilbija, The Art of Truth-telling about Authoritarian Rule, page 20