An Australian man who waved out of a car window at two young women was expected to lose his arm Monday after it was almost severed by another passing vehicle.

The 20-year-old was a passenger in a pick-up truck at Bunbury, in Western Australia state, when he waved at two women in a car wash.

But as he put his arm out the driver made a right hand turn and the man's limb was struck and almost torn off by an oncoming four-wheel-drive. "His left arm was partially severed and doctors believe the limb may need to be amputated," police said.