Police have fined a driver for having a drunken female passenger hanging out of his window on a stretch of Waikato highway.

He copped a $250 ticket and 35 demerit points after the woman's antics were spotted on State Highway 23 as the car headed towards Raglan, the Waikato road policing team reported on its Facebook page.

"The drunk passenger ... decided it would be fun to climb out the window at 90km/hr..."

The passenger was also fined $300 for her actions, but seemed unashamed, the Facebook post said.

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"The driver was apologetic, the passenger not so much."