'What a loser': Passenger mocks Harley Davidson rider before cops emerge from smoke cloud

A police car has emerged from a cloud of smoke left by a Harley Davidson to chase down the skylarking rider on a busy street in Melbourne.

The driver of a vehicle that filmed the instant karma in Southbank on Friday morning admired the "sick" motorbike as it stopped in the middle of an intersection before revving its engine and doing a burnout that left grey smog to shroud cars behind it.

"What a loser," a female passenger says.

Their car slowly turns through the intersection, the woman still deriding the motorcyclist, when through the smokey haze they spot two flashing lights.

The pair burst out laughing as police speed past them in pursuit of the offending motorcyclist.

"Was pretty funny to watch the Highway Patrol car roll up at the end. Instant karma," said Matthew, who submitted the video to the Dash Cam Owners Australia Facebook page.

It's not known if police eventually caught up with the rider.