Origin of kangaroo court [closed]

Solution 1:

kangaroo court TFD It appears is was from Texas. No Australian input other than the use of the leaping animal.

An unofficial court or a court that disregards current laws and conducts unfair trials. People who live under oppressive regimes are often treated harshly by corrupt kangaroo courts that don't abide by the law.

OED

1853 ‘P. Paxton’ Stray Yankee in Texas 205 By a unanimous vote, Judge G—— was elected to the bench and the ‘Mestang’ or ‘Kangaroo Court’ regularly organized.

Entymonline:

Kangaroo court is American English, first recorded 1850 in a Southwestern context (also mustang court), from notion of proceeding by leaps.