What a wipeout.

Jersey shore cops placed a surfer in a chokehold and threw him to the ground after he allegedly failed to display a beach access pass on his wetsuit — even though it was attached to his bag, according to a witness and wild footage.

Things got gnarly when Liam Mahoney, 28, of Junction City, California, was restrained by police officers as he insisted “Bro, I have a badge!” on Belmar Beach Tuesday, according to a video of the incident.

As the interaction grows tense, a woman in a bikini can be heard shouting, “His badge is right here!” and “Why are you arresting him?”

“Are you gonna get 10 more cops, and another cop car,  to do what?” she yells defiantly.

Mahoney then tells police that a beach pass is on his bag — but when he apparently tries to slip away from the cops, an officer places him in a chokehold and tackles him face-down in the sand, the video shows.

The disturbing arrest unfolded as beach-goers— including several children and a youngster in a stroller — watched near a shoreline walkway, footage shows.

One onlooker can be heard yelling, “get off of him!” as cops push the surfer into the ground. A second observer shouts that the scuffle is scaring children.

Mahoney was then hauled away in handcuffs by at least four police officers.

“A local surfer was arrested at Belmar Beach on 19th Avenue for not displaying a beach badge on his wetsuit, despite having the badge attached to his beach bag,” witness Austin Downs wrote in a Facebook post above footage of the incident. “During the arrest, officers placed him in a choke hold and threw him to the ground.”

It wasn’t clear what happened immediately before or after the camera started rolling.

Belmar Police Chief Tina Scott told the Asbury Park Press the department is aware of the video circulating on social media, and said Mahoney was charged with disorderly conduct, resisting arrest and obstruction of justice.

The surfer was also issued a ticket for not having a $12 beach badge, an admission pass required at some New Jersey beaches for shoreline access.

“A thorough review of the circumstances of the arrest will be conducted, in accordance with applicable New Jersey Office of the Attorney General guidelines,” Scott said.

The Jersey Shore’s Surfrider Foundation called the arrest “a disturbing incident” but stopped short of accusing cops of wrongdoing.

“Since we do not have any information about the events leading up to the video clip and why the police initially became involved, we cannot comment on the specifics of this individual situation,” the group said in a statement.

“However, we are monitoring the event and encourage Belmar officials to provide a proper public debrief to provide clarity about the incident and the authorities’ response.”

The group believes that “surfing is not a crime” and that beaches are “public resources that should be open, free, welcoming to, and safe for all people.”

On beaches in Belmar, admission badges are required from 9 a.m. to 5 p.m. on weekdays and 9 a.m. to 6 p.m. on weekends and holidays.

Scott didn’t immediately return a call from The Post Thursday.