kangaroo court /ˌkaŋɡəruː ˈkɔːt 
, ˌkaŋɡəˈruː kɔːt / ▸ noun an unofficial court held by a group of people in order to try someone regarded, especially without good evidence, as guilty of a crime or misdemeanour: they conducted a kangaroo court there and then.
– ORIGIN mid 19th century (originally in US use): of uncertain origin.
EnglishOxford Dictionary of English
