Another possibility is that the phrase could refer to the pouch of a kangaroo, meaning the court is in someone's pocket.

I'd like to see a kangaroo close up. A mama kangaroo.

like a kangaroo.

Hey, a kangaroo.

So watch this kangaroo.

Have you ever seen a kangaroo?

And immediately a voice shouted, Kangaroo!

All right. Major League kangaroo court...

What is this, a kangaroo court?

I didn't think she was a kangaroo.

They all work like this kangaroo, they bounce.

Not in front pocket. I'm a back pocket man.

So, instead we're gonna do a Major League kangaroo court.

Hydrogen pocket!

Righthand pocket.

A marsupial is a mammal with a pouch like a kangaroo.

Pocket Ethernet adapter

In your pocket...

In his pocket.

In my pocket!

In your pocket.

In the pocket.

I thought we should do our first kangaroo court of the year, baby.

Reach into my pocket.

Returned to coat pocket.

His pocket was bulging.

Two ball, side pocket.

One ball, corner pocket.

Two ball, side pocket.

nothing but a pocket.

I know. Have you got any kangaroos? What do you get for a kangaroo?

man What's in my pocket?

Fell out of Don's pocket.

Put that in your pocket.

There's something in his pocket.

It was in his pocket.

Keep five rupees pocket money

In your pocket

They do not mention their own barbaric assaults, vandalism, and looting, or their kangaroo courts.

Although looking rather like a very small kangaroo, it can climb small trees and shrubs.

I've seen my fair share of kangaroo courts, but I've never seen anything like this.

Show me what's in your pocket.

Sami was reaching into his pocket.

Still, I daresay in my pocket

It's in my pocket right now.