A teenage baby sitter got completely bombed during a beach outing on Long Island with four young kids in her care — and then went full potty-mouth on the cops who had the nerve to place her under arrest.

“So what if I had a few drinks? That’s what people my age do, you f–king loser,” Sabrina Macri, 19, told the officers, according to CBS.

Macri was so wasted after a day at Cedar Beach that she couldn’t even find the car she drove with the children, Suffolk County police said.

She finally found her 2005 Honda Civic and loaded up the kids — but by then a good Samaritan noticed the young woman’s erratic behavior and stopped her from leaving.

The Samaritan, Nicole Diaz, used her car to block in the vehicle in the Harbor Beach Road parking lot while waiting for cops to arrive. Macri cursed at the cops who showed up before she was taken into custody.

The children in the car were all boys — ranging in age from 4 to 11.

“She said she was fine, and I knew that she wasn’t so I decided to call the police,” Diaz told CBS/Channel 2.

“There would have been some kind of accident,” Diaz, who was at the beach with her mom, added. “She was stumbling and looked very confused.”

Macri, who lives in Sound Beach, was charged with DWI and a violation of Leandra’s Law — driving while ­intoxicated with children 15 or under.

She was also hit with endangering the welfare of a child and two counts of criminal possession of a controlled substance.

Macri was arraigned Friday and held on $20,000 bond or $10,000 cash bail, according to News 12/Long Island. A judge ordered her to keep away from the children and their home and school.

“It’s very early on in the proceeding, so there’s a lot of investigation to do,” Macri’s defense lawyer, Anthony Scheller, told the station. “We’re thankful that obviously there was no accident. There was nobody injured.

“She’s very remorseful about this whole situation,” he said to Channel 2.

Macri, whose social-media images include her hoisting bottles of rosé, posted to Twitter on Thursday — prior to her arrest — “Beach days are the happiest days.”

In a June tweet, she wrote, “Reading my drunk texts from last night and i was telling my groupchat my mom was talking to a flying pig wtf” along with a crying emoji.