Retch the halls!

Hundreds of red-suited revelers jammed New York City’s streets Saturday for the 21st annual SantaCon parade and pub crawl, which kicked off at 10 a.m. at Father Duffy Square on Seventh Avenue, between 46th and 47th streets.

Most of the festive partiers will be making the naughty list this year, it seems.

A twenty-something from West Virginia apparently didn’t have the stomach for the Saturday soiree. He puked and was seen passed out on the pavement outside the back entrance of McDonald’s on 42nd Street, between 7th and 8th avenues.

His West Virginia pals, Jeremy Ochopeyo, 22, and Adi Wilson, 22, called an Uber to drive their fallen comrade back to their Airbnb.

“He’s perfectly fine. We’re gonna keep partying,” an amused Ochopeyo said.

Prior to passing out, the inebriated pal couldn’t make it to the bathroom and “pissed in the middle of the McDonald’s in front of a child,” Ochopeyo said. “Some woman [there] said ‘I have f—ing child.’ I said, ‘I’m just trying to get him out of here.’ And here he lays.”

Long Island’s Bri Belajonas, 21, said her group started drinking at 7:30 a.m. and their mission was “to get drunk and have a good time.”

New Jersey’s Angel Rodriguez, 37, confessed it was his first SantaCon. He and his friends started imbibing at 10 a.m.

“If you’re in Vegas, you drink. So that’s what it is. We’re here,” Rodriguez said. “You see gift boxes, snow globes, but you also see [people] passed out on the floor.”

The alcohol-fueled extravaganza, which started in San Francisco in 1994 and came to New York four years later, is an international phenomenon — with more than 60 SantaCons in the US and across the world.