An Australian dad dressed in his underpants — and armed with nothing more than a didgeridoo — chased an intruder who broke into his home, holding him at bay until fully clothed cops arrived.

“I’ve noticed I run faster naked — semi-naked anyway,” Adelaide man Kym Abrook, 52, told Nine News of his daring chase.

The father of 12 woke up to noises in his Fulham Gardens home about 4 a.m. Monday to find a thief halfway out the door with his wallet containing $500.

Abrook immediately gave chase, picking up a nearby didgeridoo as he tracked down the thief.

“I was out there in all my glory,” he said, proudly twirling his weapon of choice and re-enacting the drama in nothing more than his board shorts for the local TV crew.

In between takes, Abrook also entertained reporters by doing the splits on his lawn.

But Abrook, who teaches Brazilian jiu-jitsu, insisted he was only going to use the Indigenous Australian instrument to restrain the intruder until police arrived.

“He’s probably lucky I only had a didgeridoo. It’s pretty solid … I was only going to use it to restrain him.”

With the help of his son Kyle and a roommate, Abrook was able to corner the thief in a neighbor’s back yard before cops found him hiding under a car and arrested him.

The 32-year-old man was charged with theft and aggravated criminal trespass, according to the Sydney Morning Herald.

“I was gaining on him and I knew when he went around the corner he wasn’t that fast,” Abrook said.

“He got off easy. He lost his shirt. I feel like giving him one, but it wasn’t the shirt I wanted to give him.”