A Massachusetts woman allegedly shot a driver for cutting her off — and bragged that she’d warned her victim on Facebook, “don’t make me spank you,” according to local reports.

Graciela Paulino, 20, was nabbed in Lowell on Thursday for killing 34-year-old construction worker Mark Devoe, who may have cut her off as he was coming back from his lunch break, the Boston Globe reported.

A pal who’d been in Devoe’s blue Hyundai with him at the time of the incident told cops they quickly realized Paulino was trailing them.

When the two men pulled up to a lot near their construction site, Paulino got out of her car and an argument erupted between her and Devoe, with the two “yelling back and forth at each other,” according to the police report.

Devoe’s pal, Brian Daigle, noticed the woman reach to the left side of her waistband and told his friend, “C’mon, forget it, it’s just a girl.”

The men left but noticed Paulino still following them, so they got out of their car near Hale Street Bridge in Lowell.

Paulino drove by, slowed down and then allegedly shot Devoe in the chest.

“I’ve been hit,” Devoe said, before jumping back into the driver’s seat to chase Paulino, and ending up crashing into a vehicle barrier.

He was taken to Lowell General Hospital, where he was pronounced dead.

Two hours after the incident, Paulino posted an ominous message on Facebook, writing, “Tried to warn Em tried to tell Em told Em stop that you my son don’t make me spank you.”

Paulino was charged with murder for the “random encounter in traffic” and “possible road rage” incident, said Middlesex District Attorney Marian T. Ryan.

The young woman appeared in Lowell District Court early Friday wearing a hooded sweatshirt and was ordered held without bail, until her next appearance March 14.

Devoe’s dad, who attended the arraignment, referenced the recent mass shooting in Parkland, Fla., when speaking to reporters outside the courthouse.

“I got a call my son’s been murdered,” he said. “I would recommend that this president make it his No. 1 priority to protect the people of this country. Let’s get this stopped. It’s going to get worse.”

A friend of his family set up a GoFundMe page to raise money for funeral expenses.