A kangaroo court is "a mock court in which the principles of law and justice are disregarded or perverted". It is essentially where the defendant has already been deemed guilty, and has little if any opportunities to object or defend himself or herself.
There is some debate over the origin of the term kangaroo court, but some sources suggest that it may have been popularized during the California Gold Rush of 1849, as a description of the hastily carried-out proceedings used to deal with the issue of claim jumping miners. Other sources claim that the term comes from the notion of justice proceeding "by leaps", like a kangaroo. The phrase is considered an Americanism and is still in common use.
As informal proceedings in sports 
The term is sometimes used without any negative connotation. For example, many Major League Baseball teams have a kangaroo court to punish players for errors and other mistakes on the field, as well as for being late for a game or practice, not wearing proper attire to road games, or having a messy locker in the clubhouse. Fines are allotted, and at the end of the year, the money collected is given to charity. The organization may also use the money for a team party at the end of the season.
See also 
- "kangaroo court". Merriam-Webster: Dictionary (online). Retrieved 2011-11-11.
- Adams, Cecil. "What's the origin of "kangaroo court"? Is "kangaroo" aborigine for "I don't know"?". The Straight Dope. Retrieved 1 October 2012.
- "Kangaroo Court" thefreedictionary.com
- Bouton, Jim (1990). Ball Four (2nd ed. ed.). Wiley. ISBN 0-02-030665-2.
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