|an irregular court, esp one set up by prisoners in a jail or by strikers to judge strikebreakers|
A court that ignores principles of justice; a court characterized by incompetence and dishonesty.
A self-appointed tribunal that violates established legal procedure; also, a dishonest or incompetent court of law. For example, The rebels set up a kangaroo court and condemned the prisoners to summary execution, or That judge runs a kangaroo courthe tells rape victims they should have been more careful. This expression is thought to liken the jumping ability of kangaroos to a court that jumps to conclusions on an invalid basis. [Mid-1800s]