He got caught with his pants down.

A would-be carjacker got dragged down the street by a defiant SUV driver, who refused to give up his ride — leaving the crook lying injured in the street in just his underwear, dramatic video shows.

The footage, taken Friday in Kent, Washington, shows the thug holding onto the handle of the driver’s door. After a few seconds, his shorts start slipping down.

At one point, the driver stops — prompting the thief to stand up and pull on the handle. The driver then takes off again, with the desperate suspect still holding on.

He eventually was arrested and taken to a hospital for treatment, police told station KIRO 7.

The suspect had punched other cars and pulled on door handles in earlier failed carjacking attempts, cops told the station.